解方程组.3y=x+5 .2x+5y=23 2x+3y=7 .3x-5y=1 3x+5y=5 .3x-4y=23.我太笨.自学.不懂这是分别得几个方程组3y=x+5 .2x+5y=23 为一组2x+3y=7 .3x-5y=1 为一组3x+5y=5 .3x-4y=23为一组
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解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7
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