谁来帮我解几道方程,重谢啊,会的快来
\u5e2e\u6211\u89e3\u51e0\u9053\u6570\u5b66\u98981\u3001\u4e00\u4e2a\u6570\u76842/5\u6bd4160\u7684\u767e\u5206\u4e4b25\u591a2\uff0c\u8fd9\u4e2a\u6570\u662f\u591a\u5c11\uff1f\uff08\u5217\u65b9\u7a0b\u89e3\uff09
\u8bbe\u8fd9\u4e2a\u6570\u662fx
2/5x=160*25%+2
0.4x=42
x=105
2\u3001\u5df2\u77e5\u5927\u6570\u7f29\u5c0f\u5230\u539f\u6765\u76841/10\u7b49\u4e8e\u5c0f\u6570\uff0c\u53c8\u77e5\u5927\u6570\u6bd4\u5c0f\u6570\u591a1107\uff0c\u5927\u6570\u662f\u591a\u5c11\uff1f\uff08\u65b9\u7a0b\uff09
1107\u00f7\uff081-0.1)=1230
\u8bbe\u5927\u6570\u662fx
x-x/10=1107
0.9x=1107
x=1230
3\u3001\u5f53X=1/4\uff0cy=1/5\u65f6\uff0c\u6c42
\uff08x+y\uff09\uff08x-y\uff09
=x^2-y^2
=1/4*1/4-1/5*1/5
=1/16-1/25
=9/400
4\u3001\u82e5\u203b\u662f\u65b0\u89c4\u5b9a\u7684\u67d0\u79cd\u8fd0\u7b97\u7b26\u53f7\uff0c\u4e14\u6709A\u203bB=\uff082AB - B\uff09/9\u3002\u8bd5\u6c425\u203bx=4\u4e2dx\u7684\u503c
(2*5x-x)/9=4
x=4
\u6839\u6c42\u9519\u4e86\u3002
\u5229\u7528\u6839\u4e0e\u7cfb\u6570\u7684\u5173\u7cfb\u89e3
a+b=6\uff0cab=4
\u539f\u5f0f=[(\u221aa)^2-(\u221ab)^2]/(a+b)
=\u221aa-\u221ab=\u221a[\u221aa-\u221ab)^2]
=\u221a[a+b-2\u221a(ab)]
=\u221a(6-4)
=\u221a2
5x-5=1
5x=1+5=6
x=6÷5
x=6/5
(2)2-(1-x)=-2
2-1+x=-2
x=-2-2+1
x=-3
(3)11x+1=5(2x+1)
11x+1=10x+5
11x-10x=5-1
x=4
(4)4x-3(20-x)=3
4x-60+3x=3
4x+3x=3+60
7x=63
x=63÷7
x=9
(5)5(x+8)-5=0
5x+40-5=0
5x=5-40=-35
x=-35÷5
x=-7
(6)2(3-x)=9
3-x=9÷2=9/2
x=3-9/2
x=-3/2
(7)-3(x+3)=24
x+3=24÷(-3)=-8
x=-8-3
x=-11
(8)-2(x-2)=12
x-2=12÷(-2)=-6
x=-6+2
x=-4
(1) x=6/5 (2) x=-3 (3) x=4 (4) x=9 (5) x=-7 (6) x=-3/2 (7) x=-11 (8) x=-4 保证全对
绛旓細瑙ｏ細锛1锛墆+2y=45 (2)x-360=312 鐢憋紙1锛夊緱3Y=45 寰梇=15 鐢憋紙2锛夌殑 X=312+360=672
绛旓細鐓х墖
绛旓細瑙ｏ細寮2鍖栫畝 x:1.5y=3:4 寰楋細X=9/8y 浠ｅ叆1寮 17/8Y=200 Y=1600/17 浠ｅ叆1寮忔眰X
绛旓細2x+140-4x=94 2x=46 x=23
绛旓細(y+12)X80%=42-y 0.8y+9.6=42-y 1.8y=42-9.6 y=18 81y-342=76(y-2)81y-76y=342-152 5y=190 y=38
绛旓細锛2m鐨勬鏁帮級=10 锛1m鐨勯挗鏉愭婚暱+锛2m鐨勯挗鏉愭婚暱锛=18 4.鐢蹭箼涓や粨搴撳瓨閲忓叡450鍚紝鐢蹭粨搴撹繍鍑60%锛屼箼浠撳簱杩愬嚭40%锛岀粨鏋滀箼浠撳簱鎵浣欑殑绮姣旂敳浠撳簱鎵浣欑殑绮澶30鍚紝鑻ョ敳浠撳簱鏈墄 鍚ㄧ伯椋燂紝涔欎粨搴撴湁y 鍚ㄧ伯椋燂紝鍒欏彲鍒楀嚭鏂圭▼(30梅60%y-40%x=450 x+y=450 )銆5.鑻ョ敳瀛︽牎鐨勪汉鏁版槸涔欏鏍′汉鏁扮殑...
绛旓細鍥炵瓟锛歺-(x-2)/5=(2x-5)/3-3 15x-3x+6=10x-25-45 (鍚屾椂涔樹互15) 2x=-66 x=-33
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绛旓細瑙ｆ柟绋缁冧範棰 1.灏忔皯浠ユ瘡灏忔椂20鍗冪背鐨勯熷害琛屼娇涓銆傛璺▼鍚庯紝绔嬪嵆娌垮師璺互姣忓皬鏃30鍗冪殑閫熷害杩斿洖鍘熷嚭鍙戝湴锛岃繖鏍峰線杩斾竴娆＄殑骞冲潎閫熷害鏄灏戯紵2.绮簵杩愭潵澶х背锛岄潰绮夊叡3700鍗冨厠锛屽凡鐭ヨ繍鏉ョ殑闈㈢矇姣斿ぇ绫崇殑2鍊嶅100鍗冨厠锛岃繍鏉ュぇ绫炽侀潰绮夊悇澶氬皯鍗冨厠?3.涓闃熷皯鍏堥槦鍛樹箻鑸硅繃娌筹紝濡傛灉姣忚埞鍧15浜猴紝杩樺墿9浜猴紝濡傛灉姣...
绛旓細4a^2-2b+c=20 (1)a^2+b+c=2 (2)9a^2+3b+c=0 (3)(1)-(2)3a^2-3b=18 a^2-b=6 (4)(3)-(2)8a^2+2b=-2 4a^2+b=-1 (5)(4)+(5)5a^2=5 a^2=1 a=1鎴朼=-1 a^2-b=6 b=a^2-6=-5 a^2+b+c=2 c=2-a^2-b=6 鎵浠=1,b=-5,c=6 鎴...
