2x+3y=10 3x+7y=34
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3x+x+4y+(90+10)x=3y-(2x+y)+510y=34x
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
x-y/7 - x+y/10 =1/2 2(x-y)-5(x+y)=3修改、、、、(x-y)/7-(x+y)/10=1/2 2(x-y)-5(x+y)=3
{ x-y/7-x+y/10=1/2 {2(x-y)+5(x+y)=3
{ x-y/7-x+y/10=1/2 {2(x-y)+5(x+y)=3
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x+y=2,3x+7y=10 求x和y
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(x+y)(2x-3y)=?
7y(x-3y)-2(3y-x)=0 .x=?,y=?
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3x+5y-(x+y)=6 2(x+y)-3x=-7