2016-11-09 18:31发布
（1）5b(2a-b)³+15(b-2a)²
=5b(2a-b)³+15(2a-b)²
=5(2a-b)²[b(2a-b)+3]
=5(2a-b)²(2ab-b²+3)
(2)(2a+3b)²-36(a-2b)²
=(2a+3b)²-(6a-12b)²
=(2a+3b+6a-12b)(2a+3b-6a+12b)
=(8a-9b)(15b-4a)
(3)3x²-2x-8
=(3x+4)(x-2)
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（1）5b(2a-b)³+15(b-2a)²
=5b(2a-b)³+15(2a-b)²
=5(2a-b)²[b(2a-b)+3]
=5(2a-b)²(2ab-b²+3)
(2)(2a+3b)²-36(a-2b)²
=(2a+3b)²-(6a-12b)²
=(2a+3b+6a-12b)(2a+3b-6a+12b)
=(8a-9b)(15b-4a)
(3)3x²-2x-8
=(3x+4)(x-2)
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