y/2+x/3=13 y/3+x/4=3

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y/2+x/3=13 y/3+x/4=3
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y/2+x/3=13 y/3+x/4=3
y/2+x/3=13 y/3+x/4=3

y/2+x/3=13 y/3+x/4=3
y/2+x/3=13 ①
y/3+x/4=3 ②
①×6得 2x+3y=78 ③
②×12得 3x+4y=36 ④
③×3得 6x+9y=234 ⑤
③×2得 6x+8y=72 ⑥
⑤-⑥得 y=162
把y=162代入③得 2x+486=78
x=-204

3y+2x=78，4y+3x=36， 9y+6x=234，8y+6x=72， y=162，x=-204

上式等价于
3y+2x=78①,4y+3x=36②
①*3-②*2得
y=162,x=-204

x=-204 y=162

(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)= 2（x+y)-3(x-y)=3 ,4(x+y)+3(x-y)=15 x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20 {(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20 4(x+y)-3(x-y)=-20,2/x+y+3/x-y=6 3(x+y)-2(x-y)=11 4(x+y)+3(x-y)=9 {3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1 3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2 （x+y）/2- x-y/2=6 3(x+y)=4(x-y) x+y/3+x-y/2=6 4(x+y)-2(x-y)=40 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 先化简再求值(x-y)(x-2y)+(x-2y)(x-3y)-2(x-3y)(x-4y) x=4 y=5 已知2y-x=-3,求[4y(2x-y)-2x(2x-y)]/(2x-y x+y+2(-x-y+1)=3(1-y-x)-4-(y+x-1),x+y=? (x+y)(x-y)+(x-y)平方-(x-y)(3x-y) 其中x=-2 y=3分之一 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 2(x+y)-(x-3y)=13 4（x+y）+3（x-3y)=1解方程组 2(x+y)-(x-3y)=13 4（x+y）+3（x-3y)=1