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

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

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

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+3ab²-4ab²+2a²b
=(5ab²+3ab²-4ab²)+(-2a²b+2a²b)
=4ab²