1.（4x-3y)-[2（x-1）+2y-3] 2.(2a-5b)-{-3b-2[4a-2（3a-b）｝

1.（4x-3y)-[2（x-1）+2y-3]=4x-3y-(2x-2+2y-3)=4x-3y-(2x+2y-5)=4x-3y-2x-2y+5=2x-5y+52.(2a-5b)-{-3b-2[4a-2（3a-b）｝=2a-5b-[-3b-2(4a-6a+2b)]=2a-5b-[-3b-2(-2a+2b)]=2a-5b-(-3b+4a-4b)=2a-5b-(4a-7b)=2a-5b+4a...