初中数学题(整式的加减)

问题描述:

初中数学题(整式的加减)
(m+2n)-(m-2n)
(2ab+5a²-2b²)-(a²+2ab-2b²)
2x-3(x-2y+3z)+2(3x-3y+2z)
8m²-[4m²-2m-(2m²-5m)]

(m+2n)-(m-2n)=m+2n-m+2n=4n(2ab+5a²-2b²)-(a²+2ab-2b²)=2ab+5a²-2b²-a²-2ab+2b²=4a²2x-3(x-2y+3z)+2(3x-3y+2z)=2x-3x+6y-9z+6x-6y+4z=5x-5z8m²-[4m&sup...