资源与评价数学七上57页22题
\u6570\u5b66\u4e03\u5e74\u7ea7\u4e0a\u8d44\u6e90\u4e0e\u8bc4\u4ef7\u7b54\u6848\u5efa\u8bae\u4ee5\u540e\u8fd8\u662f\u4e00\u9898\u4e00\u9898\u7684\u628a\u9898\u76ee\u53d1\u4e0a\u6765\uff0c\u5426\u5219\u50cf\u4f60\u73b0\u5728\u8fd9\u6837\u63d0\u95ee\u662f\u4e0d\u53ef\u80fd\u5f97\u5230\u89e3\u7b54\u7684\u3002
1\u3001\u628a200\u5343\u7c73\u7684\u6c34\u5f15\u5230\u57ce\u5e02\u4e2d\u6765\uff0c\u8fd9\u4e2a\u4efb\u52a1\u4ea4\u7ed9\u4e86\u7532\uff0c\u4e59\u4e24\u4e2a\u65bd\u5de5\u961f\uff0c\u5de5\u671f50\u5929\uff0c\u7532\uff0c\u4e59\u4e24\u961f\u5408\u4f5c\u4e8630\u5929\u540e\uff0c\u4e59\u961f\u56e0\u53e6\u6709\u4efb\u52a1\u9700\u79bb\u5f0010\u5929\uff0c\u4e8e\u662f\u7532\u961f\u52a0\u5feb\u901f\u5ea6\uff0c\u6bcf\u5929\u591a\u4fee0.6\u5343\u7c73\uff0c10\u5929\u540e\u4e59\u961f\u56de\u6765\uff0c\u4e3a\u4e86\u4fdd\u8bc1\u5de5\u671f\uff0c\u7532\u961f\u901f\u5ea6\u4e0d\u53d8\uff0c\u4e59\u961f\u6bcf\u5929\u6bd4\u539f\u6765\u591a\u4fee0.4\u5343\u7c73\uff0c\u7ed3\u679c\u5982\u671f\u5b8c\u6210\u3002\u95ee\uff1a\u7532\u4e59\u4e24\u961f\u539f\u8ba1\u5212\u5404\u4fee\u591a\u5c11\u5343\u7c73\uff1f
\u89e3\uff1a\u8bbe\u7532\u4e59\u539f\u6765\u7684\u901f\u5ea6\u6bcf\u5929\u5404\u4feea\u5343\u7c73\uff0cb\u5343\u7c73
\u6839\u636e\u9898\u610f
\uff08a+b\uff09\u00d750=200\uff081\uff09
10\u00d7\uff08a+0.6\uff09+40a+30b+10\u00d7\uff08b+0.4\uff09=200\uff082\uff09
\u5316\u7b80
a+b=4\uff083\uff09
a+0.6+4a+3b+b+0.4=20
5a+4b=19(4)
(4)-(3)\u00d74
a=19-4\u00d74=3\u5343\u7c73
b=4-3=1\u5343\u7c73
\u7532\u6bcf\u5929\u4fee3\u5343\u7c73\uff0c\u4e59\u6bcf\u5929\u4fee1\u5343\u7c73
\u7532\u539f\u8ba1\u5212\u4fee3\u00d750=150\u5343\u7c73
\u4e59\u539f\u8ba1\u5212\u4fee1\u00d750=50\u5343\u7c73
2\u3001\u5c0f\u534e\u4e70\u4e864\u652f\u81ea\u52a8\u94c5\u7b14\u548c2\u652f\u94a2\u7b14,\u5171\u4ed814\u5143;\u5c0f\u5170\u4e70\u4e86\u540c\u6837\u76841\u652f\u81ea\u52a8\u94c5\u7b14\u548c2\u652f\u94a2\u7b14,\u5171\u4ed811\u5143\u3002\u6c42\u81ea\u52a8\u7b14\u7684\u5355\u4ef7\uff0c\u548c\u94a2\u7b14\u7684\u5355\u4ef7\u3002
\u89e3\uff1a\u8bbe\u81ea\u52a8\u94c5\u7b14X\u5143\u4e00\u652f \u94a2\u7b14Y\u5143\u4e00\u652f
4X+2Y=14
X+2Y=11
\u89e3\u5f97X=1
Y=5
\u5219\u81ea\u52a8\u94c5\u7b14\u5355\u4ef71\u5143
\u94a2\u7b14\u5355\u4ef75\u5143
3\u3001\u636e\u7edf\u8ba12009\u5e74\u67d0\u5730\u533a\u5efa\u7b51\u5546\u51fa\u552e\u5546\u54c1\u623f\u540e\u7684\u5229\u6da6\u7387\u4e3a25%\u3002
\uff081\uff092009\u5e74\u8be5\u5730\u533a\u4e00\u5957\u603b\u552e\u4ef7\u4e3a60\u4e07\u5143\u7684\u5546\u54c1\u623f\uff0c\u6210\u672c\u662f\u591a\u5c11\uff1f
\uff082\uff092010\u5e74\u7b2c\u4e00\u5b63\u5ea6\uff0c\u8be5\u5730\u533a\u5546\u54c1\u623f\u6bcf\u5e73\u65b9\u7c73\u4ef7\u683c\u4e0a\u6da8\u4e862a\u5143\uff0c\u6bcf\u5e73\u65b9\u7c73\u6210\u672c\u4ec5\u4e0a\u6da8\u4e86a\u5143\uff0c\u8fd9\u683760\u4e07\u5143\u6240\u80fd\u8d2d\u4e70\u7684\u5546\u54c1\u623f\u7684\u9762\u79ef\u6bd42009\u5e74\u51cf\u5c11\u4e8620\u5e73\u65b9\u7c73\uff0c\u5efa\u7b51\u5546\u7684\u5229\u6da6\u7387\u8fbe\u5230\u4e09\u5206\u4e4b\u4e00\uff0c\u6c422010\u5e74\u8be5\u5730\u533a\u5efa\u7b51\u5546\u51fa\u552e\u7684\u5546\u54c1\u623f\u6bcf\u5e73\u65b9\u7c73\u7684\u5229\u6da6\u3002
\u89e3\uff1a\uff081\uff09\u6210\u672c=60/\uff081+25%\uff09=48\u4e07\u5143
\uff082\uff09\u8bbe2010\u5e7460\u4e07\u5143\u8d2d\u4e70b\u5e73\u65b9\u7c73
2010\u5e74\u7684\u5546\u54c1\u623f\u6210\u672c=60/\uff081+1/3\uff09=45\u4e07
60/b-2a=60/\uff08b+20\uff09\uff081\uff09
45/b-a=48/\uff08b+20\uff09\uff082\uff09
\uff082\uff09\u00d72-\uff081\uff09
30/b=36/\uff08b+20\uff09
5b+100=6b
b=100\u5e73\u65b9\u7c73
2010\u5e74\u6bcf\u5e73\u65b9\u7c73\u7684\u623f\u4ef7=600000/100=6000\u5143
\u5229\u6da6=6000-6000/\uff081+1/3)=1500\u5143
4\u3001\u67d0\u5546\u5e97\u7535\u5668\u67dc\u7b2c\u4e00\u5b63\u5ea6\u6309\u539f\u5b9a\u4ef7\uff08\u6210\u672c+\u5229\u6da6\uff09\u51fa\u552eA\u79cd\u7535\u5668\u82e5\u5e72\u4ef6\uff0c\u5e73\u5747\u6bcf\u4ef6\u83b7\u5f97\u767e\u5206\u4e4b25\u7684\u5229\u6da6\u3002\u7b2c\u4e8c\u5b63\u5ea6\u56e0\u5229\u6da6\u7565\u6709\u8c03\u9ad8\uff0c\u5356\u51faA\u79cd\u7535\u5668\u7684\u4ef6\u6570\u53ea\u6709\u7b2c\u4e00\u5b63\u5ea6\u5356\u51faA\u79cd\u7535\u5668\u76846\u5206\u4e4b5\uff0c\u4f46\u83b7\u5f97\u7684\u603b\u5229\u6da6\u5374\u4e0e\u7b2c\u4e00\u5b63\u5ea6\u76f8\u540c\u3002
\uff081\uff09\u6c42\u8fd9\u4e2a\u67dc\u53f0\u7b2c\u4e8c\u5b63\u5ea6\u5356\u51faA\u79cd\u7535\u5668\u5e73\u5747\u6bcf\u4ef6\u83b7\u5229\u6da6\u767e\u5206\u4e4b\u51e0\uff1f
\uff082\uff09\u8be5\u67dc\u53f0\u7b2c\u4e09\u5b63\u5ea6\u6309\u7b2c\u4e00\u5b63\u5ea6\u5b9a\u4ef7\u7684\u767e\u5206\u4e4b90\u51fa\u552eA\u79cd\u7535\u5668\uff0c\u7ed3\u679c\u5356\u51fa\u7684\u4ef6\u6570\u6bd4\u7b2c\u4e00\u5b63\u5ea6\u589e\u52a0\u4e861.5\u500d\uff0c\u6c42\u7b2c\u4e09\u5b63\u5ea6\u51fa\u552e\u7684A\u79cd\u7535\u5668\u7684\u5229\u6da6\u6bd4\u7b2c\u4e00\u5b63\u5ea6\u51fa\u552e\u7684A\u79cd\u7535\u5668\u7684\u603b\u5229\u6da6\u589e\u52a0\u767e\u5206\u4e4b\u51e0\uff1f
\u89e3\uff1a\uff081\uff09\u8bbe\u6210\u672c\u4e3aa\uff0c\u5356\u51fa\u4ef6\u6570\u4e3ab\uff0c\u7b2c\u4e8c\u5b63\u5ea6\u5229\u6da6\u7387\u4e3ac
\u90a3\u4e48\u5229\u6da6=a\u00d725%=1/4a
\u7b2c\u4e8c\u5b63\u5ea6\u5356\u51fa\u7535\u56685/6b\u4ef6
\u7b2c\u4e00\u5b63\u5ea6\u7684\u603b\u5229\u6da6=1/4ab
\u7b2c\u4e8c\u5b63\u5ea6\u5229\u6da6=ac\u00d75/6b=5/6abc
\u6839\u636e\u9898\u610f
1/4ab=5/6abc
c=1/4\u00d76/5
c=3/10=30%
\uff082\uff09\u7b2c\u4e00\u5b63\u5ea6\u5b9a\u4ef7=a\uff081+25%\uff09=5/4a
\u7b2c\u4e09\u5b63\u5ea6\u5b9a\u4ef7=5/4a\u00d790%=9/8a
\u7b2c\u4e09\u5b63\u5ea6\u5356\u51fa\uff081.5+1\uff09b=2.5b\u4ef6
\u7b2c\u4e09\u5b63\u5ea6\u7684\u603b\u5229\u6da6=9/8a\u00d72.5b-2.5ab=5/16ab
\u7b2c\u4e09\u5b63\u5ea6\u6bd4\u7b2c\u4e00\u5b63\u5ea6\u603b\u5229\u6da6\u589e\u52a0\uff085/16ab-1/4ab\uff09/\uff081/4ab\uff09=\uff081/16\uff09/\uff081/4\uff09=0.25=25%
5\u3001\u5c06\u82e5\u5e72\u53ea\u9e21\u653e\u5165\u82e5\u5e72\u4e2a\u7b3c\u4e2d\u3002\u82e5\u6bcf\u4e2a\u7b3c\u4e2d\u653e4\u53ea\uff0c\u5219\u6709\u4e00\u53ea\u9e21\u65e0\u7b3c\u53ef\u653e\uff1b\u82e5\u6bcf\u4e2a\u7b3c\u4e2d\u653e5\u53ea\uff0c\u5219\u6070\u6709\u4e00\u7b3c\u65e0\u9e21\u53ef\u653e\uff0c\u90a3\u4e48\uff0c\u9e21\u3001\u7b3c\u5404\u591a\u5c11\uff1f
\u8bbe\u9e21\u6709x\u53ea\uff0c\u7b3c\u6709y\u4e2a
4y+1=x
5\uff08y-1\uff09=x
\u5f97\u5230x=25\uff0cy=6
6\u3001\u7528\u767d\u94c1\u76ae\u505a\u7f50\u5934\u76d2\uff0c\u6bcf\u5f20\u94c1\u76ae\u53ef\u5236\u6210\u76d2\u8eab25\u4e2a\uff0c\u6216\u5236\u76d2\u5e9540\u4e2a\uff0c\u4e00\u4e2a\u76d2\u8eab\u548c\u4e24\u4e2a\u76d2\u5e95\u914d\u6210\u4e00\u5957\u7f50\u5934\u76d2\uff0c\u73b0\u670936\u5f20\u767d\u94c1\u76ae\uff0c\u7528\u591a\u5c11\u5f20\u5236\u76d2\u8eab\uff0c\u591a\u5c11\u5f20\u5236\u76d2\u5e95\u53ef\u4ee5\u4f7f\u76d2\u8eab\u4e0e\u76d2\u5e95\u6b63\u597d\u914d\u5957\uff1f
\u5206\u6790:\u56e0\u4e3a\u73b0\u5728\u603b\u670936\u5f20\u94c1\u76ae\u5236\u76d2\u8eab\u548c\u76d2\u5e95.\u6240\u4ee5x+y=36.\u516c\u5f0f;\u7528\u5236\u76d2\u8eab\u7684\u5f20\u6570+\u7528\u5236\u76d2\u5e95\u7684\u5f20\u6570=\u603b\u5171\u5236\u6210\u7f50\u5934\u76d2\u7684\u767d\u94c1\u76ae\u7684\u5f20\u657036.\u5f97\u51fa\u65b9\u7a0b(1).\u53c8\u56e0\u4e3a\u73b0\u5728\u4e00\u4e2a\u76d2\u8eab\u4e0e2\u4e2a\u76d2\u5e95\u914d\u6210\u4e00\u5957\u7f50\u5934\u76d2.\u6240\u4ee5;\u76d2\u8eab\u7684\u4e2a\u6570*2=\u76d2\u5e95\u7684\u4e2a\u6570.\u8fd9\u6837\u5c31\u80fd\u4f7f\u5b83\u4eec\u4e2a\u6570\u76f8\u7b49.\u5f97\u51fa\u65b9\u7a0b(2)2*16x=40y
x+y=36 (1)
2*16x=40y (2)
\u7531(1)\u5f9736-y=x (3)
\u5c06(3)\u4ee3\u5165(2)\u5f97;
32(36-y)=40y
y=16
\u53c8y=16\u4ee3\u5165(1)\u5f97:x=20
\u6240\u4ee5;x=20
y=16
\u7b54:\u752820\u5f20\u5236\u76d2\u8eab,\u752816\u5236\u76d2\u5e95.
\u53c2\u8003\u4e00\u4e0b
原料22500是184千克的总价格吧？那答案就是（22500+80*0.5）/100+0.38=225.78
（22500*184+80*0.5+0.38*100）/100
绛旓細杩欓噷鏈夛紝蹇偣鍘讳笅锛屾椂闂撮暱浜嗗氨娌′簡 鍙傝冭祫鏂欙細http://202.97.254.98/
绛旓細fagezhao pian
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绛旓細21.鐢遍鎰忓緱35a+33b+3c-3=5,鈭35a+33b+3c=8,鈭(-3)5a+(-3)3b+(-3)c-3=-(35a+33b+3c)-3=-8-3=-11,22.鍘熷紡=-9,鍘熷紡鐨勫间笌a鐨勫彇鍊兼棤鍏.23.鈭 ,= ,= .鈭磋兘琚13鏁撮櫎.鍥. ,鏈14浣嶆鏁存暟.1.7 骞虫柟宸叕寮忥紙1锛1.36-x2,x2- ; 2.-2a2+5b;3.x+1;4.b+c,b...
绛旓細鎴戜細
绛旓細鍥炵瓟锛氭眰澶氱偣璐㈠瘜鍊
绛旓細鈪ゃ鎷撳睍璧勬簮 鈪ャ璇勪环寤鸿涓庢祴璇曢 绗叚绔犮骞抽潰鐩磋鍧愭爣绯 鈪犮鎬讳綋璁捐 鈪°鏁欐潗鍒嗘瀽 6.1銆骞抽潰鐩磋鍧愭爣绯 6.2銆鍧愭爣鏂规硶鐨勭畝鍗曞簲鐢 鏁板娲诲姩 灏忕粨 澶嶄範棰6 鈪涔犻瑙ｇ瓟 鈪ｃ鏁欏璁捐鍙傝冩渚 6.1銆骞抽潰鐩磋鍧愭爣绯伙紙绗1璇炬椂锛夆叅銆鎷撳睍璧勬簮 鈪ャ璇勪环寤鸿涓庢祴璇曢 绗竷绔犮涓夎褰 鈪犮鎬讳綋...
绛旓細杩囩偣D鍋欴E鍨傜洿浜巒AB骞朵笌fAB鐩镐氦浜巆鐐笶 鍦≧t涓塶瑙掑舰涓8锛欴C=DE=2銆8锛堣鍒2绾夸笂r鐨勭偣鍒拌涓よ竟鐨勮窛绂荤浉绛夛級锛孊D=0銆8锛屾墍浠0BE=3 BE銆侱E=BC銆侫C(鐩镐技涓塳瑙掑舰瀵瑰簲杈规垚姣6渚嬶級鎵浠0AC=62011-10-30 17:56:19
绛旓細2+1+1=4锛堜唤锛夋墍浠ュ効瀛2/4 姣嶄翰鍜屽コ鍎1/4
绛旓細1鍒皀鐨勫钩鏂瑰拰涓簄(n+1)(2n+1)/6 鎵浠ュ師寮 = 97*锛97+1锛*锛2*97+1锛/6 + 3*(1+4+7+...+97)= 97*锛97+1锛*锛2*97+1锛/6 + 3*(1+97)/2 * 33 = 308945+4851 = 313796 閲囩撼閲囩撼閲囩撼閲囩撼閲囩撼閲囩撼閲囩撼閲囩撼閲囩撼閲囩撼閲囩撼閲囩撼閲囩撼閲囩撼 ...
