北师大版八年级下册数学书第98页练习答案
时间: 12-12
目录
1第98页练习答案
解:(1)x(a+b)+y(a+b)
=(a+b)(x+y)
(2)3a(x-y)-(x-y)
=(x-y)(3a-1)
(3)6(p+q)2-12(q + p)
=6(p+q)(p+q-2)
(4)a(m-2)+b(2-m)
=a(m-2)-b(m-2)
=(m-2)(a-b)
(5)2(y-x)2+3(x-y)
=2(x-y)2+3(x-y)
=(x-y)[2(x-y)+3]
=(x-y)(2x-2y+3)
(6)mn(m-n)-m(n-m)2
=mn(m-n)-m(m-n)2
=m(m-n)[n-(m-n)]
=m(m-n)(n-m+n)
=m(m-n)(2n-m)