(2a+b)^2-(3a-b)^2+5a(a-b)
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(2a+b)^2-(3a-b)^2+5a(a-b)(2a+b)^2-(3a-b)^2+5a(a-b)(2a+b)^2-(3a-b)^2+5a(a-b)(2a+b)²-(3a-b)²
(2a+b)^2-(3a-b)^2+5a(a-b)
(2a+b)^2-(3a-b)^2+5a(a-b)
(2a+b)^2-(3a-b)^2+5a(a-b)
(2a+b)²-(3a-b)²+5a(a-b)
=4a²+4ab+b²-(9a²-6ab+b²)+5a²-5ab
=4a²+4ab+b²-9a²+6ab-b²+5a²-5ab
=5ab
(2a+b)2-(3a-b)2+5a(a-b)
=4a^2+4ab+b^2-9a^2+6ab-b^2+5a^2-5ab
=5ab
=1/10
原式=4a²+4ab+b²-9a²+6ab-b²+5a²-5ab
=4ab+6ab-5ab
=5ab
满意望采纳
(2a+b)^2-(3a-b)^2+5a(a-b)=4a^2+4ab+b^2-9a^2+6ab-b^2+5a^2-5ab=ab
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