人教版八年级上小专题(12)因式分解同步练习含答案.doc

小专题(十二)因式分解类型1只提不套型1因式分解：(1)3ab2a2b；(2)2a24a；(3)m(5m)2(m5)；(4)5x(x2y)320y(2yx)3.类型2只套不提型2因式分解：(1)4x225；(2)a24a4；(3)(a3)2(ab)2；(4)(x1)26(x1)9；(5)(ab)24(ab)4；(6)(x29)236x2；(7)p22pqq2k2；(8)k24p212pq9q2.类型3先提后套型3因式分解：(1)x2y9y；(2)ax3axy2；(3)3x36x2y3xy2；(4)4x38x24x；(5)2x22x；(6)3m(2xy)23mn2.类型4先破后立型(根据实际情況选做)4因式分解：(1)x(x1)3x4；(2)(xy)24(xy1)；(3)(x2y)28xy；(4)(x3)(x5)x225；(5)(cb)(cb)a(a2b)；(6)x(x1)(x2)(x3)1.参考答案1(1)原式ab(3ba)(2)原式2a(a2)(3)原式(m2)(5m)(4)原式5(x2y)3(x4y)2.(1)原式(2x5)(2x5)(2)原式(a2)2.(3)原式(2ab3)(3b)(4)原式(x4)2.(5)原式(ab2)2.(6)原式(x3)2(x3)2.(7)原式(pqk)(pqk)(8)原式(k2p3q)(k2p3q)3.(1)原式y(x3)(x3)(2)原式ax(xy)(xy)(3)原式3x(xy)2.(4)原式4x(x1)2.(5)原式(2x1)2.(6)原式3m(2xyn)(2xyn)4.(1)原式(x2)2.(2)原式(xy2)2.(3)原式(x2y)2.(4)原式2(x5)(x1)(5)原式(cab)(cab)(6)原式(x23x1)2.21