5ab^2-{2a^b-[3ab^2-(4ab^2-2a^2b)]}

问题描述:

5ab^2-{2a^b-[3ab^2-(4ab^2-2a^2b)]}

原式=5ab²-{2a²b-[3ab²-(4ab²-2a²b)]}=5ab²-[2a²b-(3ab²-4ab²+2a²b)]=5ab²-(2a²b-3ab²+4ab²-2a²b)=5ab²-2a²b+3ab²-4ab...