轻松上初中数学答案
\u8f7b\u677e\u4e0a\u521d\u4e2d\u6570\u5b66\u7b54\u684818.(-7y)+12y-8y
=12y-(7y+8y)
=12y-15y
=3y
5a-2/3b+4a-1/3b
=(5a+4a)-(2/3b+1/3b)
=9a-b
(-3)\u00d72ab+5ab\u00d76
=-6ab+30ab
=24ab
\u6839\u53f719p+2\u6839\u53f719p+\u6839\u53f719
=\u6839\u53f719\u00d7\uff08p+2p+1\uff09
=3\u6839\u53f719p+\u6839\u53f719
=4\u6839\u53f719p
19(1).2/7x+2/7x-2/5x+39
=4/7x-2/5x+39
=6/35x+39
(2).2/7\u00d735+2/7\u00d735-2/5\u00d735+39
=20-14+39
=6+39
=45
20.\uff08\u9898\u76ee\u7565\uff09
(12x-1/4)\u00d712-(5x+1/6)\u00d712=x/3\u00d712
36x-3-10x-2=4x
26x-4x=5
x=5/22
\uff08\u9898\u76ee\u7565\uff09
(2x-1/0.7)\u00d721=x/0.3\u00d721-1/7\u00d721
60x-70x=30-3
x=-2.7
1.\u7b54\u6848\uff1a4\u5c81 5\u5c81 6\u5c81 7\u5c81
\u6b64\u9898\u4e3a\u5f00\u653e\u6027\u9898..\u601d\u8def\u6709\u5f88\u591a..\u4e00\u822c\u4e3a\u4e00\u4e0b\u51e0\u79cd\uff1a
\u2474\u5206\u89e3\u8d28\u56e0\u6570\uff1a\u5c06840\u5206\u89e3..\u5c31\u53ef\u5f97\u51fa\uff1a840=4\u00d75\u00d76\u00d77
\u2475\u6570\u5b66\u601d\u60f3\uff1aX\uff08X+1\uff09\uff08X+2\uff09\uff08X+3\uff09=840 \u89e3\u65b9\u7a0b\u5f97 X=4\uff08\u4e0d\u5e38\u7528\uff09
\u2476\u731c\u60f3\uff1a\u6839\u636e\u9898\u610f\u30014\u4e2a\u5c0f\u670b\u53cb..\u4e00\u822c\u5c3110\u5c81\u4ee5\u4e0b.\u53ef\u4ee5\u4e00\u4e2a\u4e2a\u8bd5\u3001
2.1771903/1883
\u672c\u9898\u4e3a\u9ad8\u65af\u601d\u60f3\u7684\u8003\u5bdf
\u542c\u8bf4\u8fc7\u201c1+2+3+...+100=5050\u201d\u8fd9\u4e2a\u6545\u4e8b\u5417\uff1f\u9053\u7406\u662f\u4e00\u6837\u3001
\u540c\u5206\u6bcd\u5206\u6570\u52a0\u6cd5..\u5206\u6bcd\u4e0d\u53d8..\u5206\u5b50\u76f8\u52a0..
1+2+\u2026\u2026+1882=\uff081+1882\uff09+\uff082+1881\uff09+ \u2026 +\uff08941+942\uff09
=1883\u00d7941
=1771903
\u5373\uff1a1771903/1883
3.2003
\u539f\u5f0f=2002+\uff082001-2000\uff09-\uff081999-1998\uff09+....-\uff083-2\uff09+1
=2002+1-1+1-1+...-1+1
=2002+1
=2003
4.45/99
\u539f\u5f0f=1/3+\uff082/5-1/3\uff09+\uff083/7-2/5\uff09+\uff084/9-3/7\uff09+\uff0845/99-4/9\uff09
=1/3 - 1/3 + 2/5 - 2/5 + 3/7 - 3/7 + 4/9 - 4/9 + 45/99
=45/99
5.\u24747*7=36 \u2475 X=11 \u6216 X=-9
\u24747*7=7\u00d77-7-7+1=36
\u2475\u6839\u636e\u9898\u610f\uff1aX \u00d7 X - X - X + 1=100
\u89e3\u5f97\uff1aX=11 \u6216\u8005 X=-9
6.14\u5c0f\u65f6
\u201c\u7532\u7ba1\u6ce8\u6c34\u7684\u901f\u5ea6\u662f\u4e59\u7ba1\u76841.5\u500d\u201d
\u201c\u540c\u65f6\u5f00\u653e\u7532\u4e59\u4e24\u6c34\u7ba1\u5411\u6e38\u6cf3\u6c60\u6ce8\u6c3412\u5c0f\u65f6\u53ef\u4ee5\u6ce8\u6ee1\u201d
\u6839\u636e\u8fd9\u4e24\u4e2a\u6761\u4ef6 \u53ef\u6c42\u51fa\uff1a
\u7532\u7ba120\u5c0f\u65f6 \u53ef\u4ee5\u6ce8\u6ee1\u6e38\u6cf3\u6c60
\u201c\u5269\u4e0b\u7684\u7531\u4e59\u7ba1\u6ce89\u5c0f\u65f6\u5c06\u6e38\u6cf3\u6c60\u6ce8\u6ee1\u201d
\u201c\u7532\u7ba1\u6ce8\u6c34\u7684\u901f\u5ea6\u662f\u4e59\u7ba1\u76841.5\u500d\u201d
\u8fd9\u4e24\u4e2a\u6761\u4ef6\u53ef\u5f97\uff1a\u4e59\u7ba1\u6ce89\u5c0f\u65f6\u76f8\u5f53\u4e8e\u7532\u7ba1\u6ce8\u4e866\u4e2a\u5c0f\u65f6
\u537320-6=14\uff08\u5c0f\u65f6\uff09
7.3900\u4e2a
\u89e3\uff1a\u8bbe\u539f\u8ba1\u5212X\u5929\u5b8c\u6210\u3002
50\uff08X+8\uff09=60(X-5\uff09
\u89e3\u5f97\uff1aX=70
\u5373\uff1a\u539f\u8ba1\u521270\u5b8c\u6210
50\u00d7(70+8)=3900(\u4e2a)
\u6216
60\u00d7(70-5)=3900(\u4e2a\uff09
\u5176\u4e2d\u3001
\u7b2c\u4e94\u9898\u5c5e\u4e8e\u4e00\u4e2a\u7c7b\u578b..\u65b0\u7b26\u53f7\u53d8\u6362\u9898\u3002
\u7b2c\u516d\u9898\u91cd\u5728\u7406\u89e3..\u4e5f\u8bb8\u6211\u8bf4\u7684\u4e0d\u592a\u660e\u4e86\u3001\u5e0c\u671b\u60a8\u53ef\u4ee5\u8c05\u89e3\u3002
\u5982\u6211\u56de\u7b54\u6709\u9519\u8bef\u3001 \u4e5f\u5e0c\u671b\u60a8\u53ef\u4ee5\u6307\u51fa\u3002
\u613f\u60a8\u5728\u521d\u4e2d\u5b66\u4e60\u6109\u5feb\u3001
\u8c22\u8c22...
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乖，给个题目先
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