计算;3(ab-5b²+2a²)-(7ab+16a²-25b²).

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计算;3(ab-5b²+2a²)-(7ab+16a²-25b²).计算;3(ab-5b²+2a²)-(7ab+16a²-25b&#

计算;3(ab-5b²+2a²)-(7ab+16a²-25b²).
计算;3(ab-5b²+2a²)-(7ab+16a²-25b²).

计算;3(ab-5b²+2a²)-(7ab+16a²-25b²).
3(ab-5b²+2a²)-(7ab+16a²-25b²)=10b²-10a²-4ab