1.A 2.2xy2-x2y 3.6 4.-3x+y2,65.-15a4+a3 6.B7.解:(1)(3×5)2=152=225.32×52=9×25=225;〔(-)×4〕2=(-2)2=4.(-)2×42=×16=4上面每組的兩個算式的計算結(jié)果是相等的.(2)(ab)3=a3b3(3)當(dāng)n為正整數(shù)時,(ab)n=anbn.證明:當(dāng)n為正整數(shù)時,則有(ab)n==×=anbn (共 253 字) [閱讀本文] >>
海量資源,盡在掌握
 1.A 2.2xy2-x2y 3.6 4.-3x+y2,65.-15a4+a3 6.B7.解:(1)(3×5)2=152=225.32×52=9×25=225;〔(-)×4〕2=(-2)2=4.(-)2×42=×16=4上面每組的兩個算式的計算結(jié)果是相等的.(2)(ab)3=a3b3(3)當(dāng)n為正整數(shù)時,(ab)n=anbn.證明:當(dāng)n為正整數(shù)時,則有(ab)n==×=anbn (共 253 字) [閱讀本文] >>