(2a+b)²-(3a-b)²+5a﹙a-b)先化简,在求值

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(2a+b)²-(3a-b)²+5a﹙a-b)先化简,在求值
(2a+b)²-(3a-b)²+5a﹙a-b)
先化简,在求值

(2a+b)²-(3a-b)²+5a﹙a-b)先化简,在求值
(2a+b)²-(3a-b)²+5a﹙a-b)
解,得:
==[(2a+b)+(3a-b)]*[(2a+b)-(3a-b)]+5a(a-b)
==(5a)*(2b-a)+5a^2-5ab
==10ab-5a^2+5a^2-5ab
==10ab