(1)4x²-(1/4)y² (2)8xy-x²-16y² (3)2m(a-b)-6m(b-a) (4)3x-12x的3次方

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(1)4x²-(1/4)y²(2)8xy-x²-16y²(3)2m(a-b)-6m(b-a)(4)3x-12x的3次方(1)4x²-(1/4)y

(1)4x²-(1/4)y² (2)8xy-x²-16y² (3)2m(a-b)-6m(b-a) (4)3x-12x的3次方
(1)4x²-(1/4)y² (2)8xy-x²-16y² (3)2m(a-b)-6m(b-a) (4)3x-12x的3次方

(1)4x²-(1/4)y² (2)8xy-x²-16y² (3)2m(a-b)-6m(b-a) (4)3x-12x的3次方
(1)4x²-(1/4)y²
=(2x+1/2y)(2x-1/2y)
(2)8xy-x²-16y²
=-(x² -8xy+16y² )
=-(x-4y)²
(3)2m(a-b)-6m(b-a)
=2m(a-b)+6m(a-b)
=8m(a-b)
(4)3x-12x的3次方
=3x(1-4x² )
=3x(1+2x)(1-2x)
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