习题8.4第1题答案
(1)a(x-y+z)
(2)3ab(2a-5b+10ab)
(3)5(y-x) (2ay-2ax-b)
(4)(a-x) (a-y) (x-y)
习题8.4第2题答案
(1)31.4
(2)3.256
(3)999984
(4)10000
习题8.4第3题答案
100 v
习题8.4第4题答案
(1) (x-3a) 2
(2)4(x+5)(x-25)
(3)(5m-8) 2
(4)(0.7x+12y) (0.7x-12y)
习题8.4第5题答案
(1)y2 (y+1)(y-1)
(2)3a(x+y)(x-y)
(3)4x=(x2-2x+1)=4x(x-1)2
(4) (a-b-c) 2