沪科版七年级下册数学课本82页答案:
1.(1)6x²;(2)a-3.
2.(1)原式=n(p-q).(2)原式=-xy(x²+xy-1).
3.(1)原式=3(a+b)[(a+b)+2]=3(a+b)(a+b+2).
(2)原式=(a-b)(m-n).
(3)原式=6(x-y)³-3y(x-y)²=3(x-y)²[2(x-y)-y]=3(x-y)²(2x-3y).
(4)原式=mn(m-n)-m(m-n)²=m(m-n)·[n-(m-n)]=m(m-n)(2n-m).
试卷导航沪科版七年级下册数学课本82页答案:
1.(1)6x²;(2)a-3.
2.(1)原式=n(p-q).(2)原式=-xy(x²+xy-1).
3.(1)原式=3(a+b)[(a+b)+2]=3(a+b)(a+b+2).
(2)原式=(a-b)(m-n).
(3)原式=6(x-y)³-3y(x-y)²=3(x-y)²[2(x-y)-y]=3(x-y)²(2x-3y).
(4)原式=mn(m-n)-m(m-n)²=m(m-n)·[n-(m-n)]=m(m-n)(2n-m).
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