1、x-y=1,3x+2y=-1;2、2x+3y=5,4x-3y=7;3、4x-3y=11,2x+y=13;4、x-y=8,3x+y=12.要写 由①+②或者是①-②什么的哈~
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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
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