x=y+3 2x+y=18
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x=y+3 2x+y=18
x=y+3 2x+y=18
x=y+3 2x+y=18
x=y+3 ① 2x+y=18 ② 将①变形 得 x-y=3 ③ ②+③ 得 3x=21 x=7 代入③ 得 y=4 所以 x=7 y=4
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(x+y)(2x-3y)=?
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若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值
{x-3y=2,2x+y=18
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x=y+3 2x+y=18
2(x+y)-3(x-y)=3 ,4(x+y)+3(x-y)=15
x+y=-3 xy+x+y=-2 x/y+y/x=?
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x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2
计算:y(x-y)^2+(y-x)^3=?