计算:(1)(m+2n)-(m-2n)(2)2(x-3)-(-x+4)(3)2x-3(x-2y+3x)+2(3x-3y+2z)(4)8m 2 -[4m
计算:(1)(m+2n)-(m-2n)(2)2(x-3)-(-x+4)(3)2x-3(x-2y+3x)+2(3x-3y+2z)(4)8m2-[4m2-2m-4(2m2-5...
计算:(1)(m+2n)-(m-2n)(2)2(x-3)-(-x+4)(3)2x-3(x-2y+3x)+2(3x-3y+2z)(4)8m 2 -[4m 2 -2m-4(2m 2 -5m)].
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