若2x+3y=4,2y+3x=7,则x-y的值为?
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若2x+3y=4,2y+3x=7,则x-y的值为?若2x+3y=4,2y+3x=7,则x-y的值为?若2x+3y=4,2y+3x=7,则x-y的值为?2x+3y=4,2y+3x=7相减(2y+3x)-
若2x+3y=4,2y+3x=7,则x-y的值为?
若2x+3y=4,2y+3x=7,则x-y的值为?
若2x+3y=4,2y+3x=7,则x-y的值为?
2x+3y=4,2y+3x=7
相减
(2y+3x)-(2x+3y)=7-4
x-y=3
后面的减前面的式子得到3
当然你也可以算出具体xy等于多少算
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x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20
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x+y/3+x-y/2=6 4(x+y)-2(x-y)=40
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1