2x-{-3y+[2x-(3x-y)]},
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2x-{-3y+[2x-(3x-y)]},2x-{-3y+[2x-(3x-y)]},2x-{-3y+[2x-(3x-y)]},去括号,答案应该是3x+2y.先紧括号里的做,顺序是小括号中括号大括号.正
2x-{-3y+[2x-(3x-y)]},
2x-{-3y+[2x-(3x-y)]},
2x-{-3y+[2x-(3x-y)]},
去括号,答案应该是3x+2y.先紧括号里的做,顺序是小括号中括号大括号.正负得负,正正得正,负负得正
=2x-{-3y+[2x-3x+y]}
=2x-{-3y+y-x}
=2x-{-2y-x}
=3x+2y
x(x-y)2-(y-x)3
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计算：x+2y/x-y+2x/y-x-3y/x-y
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2X(2X-3Y)-3Y(X+Y)
(-2x y)^2-(3y-x)(-x-3y)
（x+2y)^2-(x+y)(3x-y)
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