计算(1) (3x-2y)-(-x-y) (2)2(x-3)-3(2x-5)
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计算(1) (3x-2y)-(-x-y) (2)2(x-3)-3(2x-5)
计算(1) (3x-2y)-(-x-y) (2)2(x-3)-3(2x-5)
计算(1) (3x-2y)-(-x-y) (2)2(x-3)-3(2x-5)
(1) (3x-2y)-(-x-y)
=3x-2y+x+y
=3x+x+y-2y
=4x-y
(2)2(x-3)-3(2x-5)
=2x-6x+15-6
=-4x+9
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