沪科版七年级下册数学课本84页答案:
1.(1)原式=2x(x²-16)=2x(x+4)(x-4)
(2)原式=ab(9a²b²-1)=ab(3ab+1)(3ab-1)
(3)原式=m(x²-8x+16)=m(x-4)²
(4)原式=256-x⁴=(16+x²)(16-x²)=(16+x²)(4+x)·(4-x)
(5)原式=-a(1-2a+a²)=-a(a-1)²
(6)原式=(9a²)²-2·9a²·4b²+(4b²)²
=(9a²-4b²)²
=(3a+2b)²(3a-2b)²
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