化简:(1)[2b-3+2(a²-1)]-(4a²-3b²)(2)(3x²y-xy²)-3(x²y-2xy²)[2b²-3+2(a²-1)]-(4a²-3b²)

问题描述:

化简:(1)[2b-3+2(a²-1)]-(4a²-3b²)
(2)(3x²y-xy²)-3(x²y-2xy²)
[2b²-3+2(a²-1)]-(4a²-3b²)