试卷导航
沪科版七年级下册数学课本86页答案:
1.(1)原式=(4a²-b²)+(4a-2b)=(2a+b)(2a-b)+2(2a-b)=(2a-b)(2a+b+2)
(2)原式=(x²-2xy+y²)-1=(x-y)²-1=(x-y+1)(x-y-1)
(3)原式=(9x²-y²)+(6x+2y)=(3x+y)(3x-y)+2(3x+y)=(3x+y)(3x-y+2)
2.(1)原式=x²-6x+9-1
=(x-3)²-1
=(x-3+1)(x-3-1)
=(x-2)(x-4)
(2)原式=(x-2)(x+5)
心标教育公众号