{X+2Y/2+3X-Y/3=5{0.2(X+2Y)+0.8(3X-Y)=4

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{X+2Y/2+3X-Y/3=5{0.2(X+2Y)+0.8(3X-Y)=4
{X+2Y/2+3X-Y/3=5{0.2(X+2Y)+0.8(3X-Y)=4

{X+2Y/2+3X-Y/3=5{0.2(X+2Y)+0.8(3X-Y)=4
令a=x+2y
b=3x-y
a/2+b/3=5 (1)
0.2a+0.8b=4 (2)
所以a=20-4b
代入(1)
10-2b+b/3=5
5b/3=5
b=3
a=20-4b=8
所以x+2y=8 (3)
3x-y=3 (4)
(4)×2+(3)
7x=14
x=2
y=3x-3=3

已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2 3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2 (x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5) 4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11 3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27 6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5 先化简再求值(x-y)(x-2y)+(x-2y)(x-3y)-2(x-3y)(x-4y) x=4 y=5 {(x+y)/2+(x-y)/3=1,(x+y)-5(x-y)=2.求x=?,y=? 化简:5(x-y)+2(x+y)-3(x-y) {X+2Y/2+3X-Y/3=5{0.2(X+2Y)+0.8(3X-Y)=4 (x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)= (x+y)(x-y)+(x-y)平方-(x-y)(3x-y) 其中x=-2 y=3分之一化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1 (2x-3y)-(5x-y) (2X-3y)-(5x-y) (2x-5y)(3x+y) (x+y)(2x-3y)=?