16.2分式的运算第1课时课前自主练1.计算下列各题:(1)32×16=______;(2)35÷45=_______;(3)3a·16ab=________;(4)(a+b)·4ab2=________;(5)(2a+3b)(a-b)=_________.2.把下列各式化为最简分式:(1)2216816aaa=_________;(2)2222()()xyzxyz=_________.3.分数的乘法法则为_____________________________________________________;分数的除法法则为_____________________________________________________.4.分式的乘法法则为____________________________________________________;分式的除法法则为____________________________________________________.课中合作练题型1:分式的乘法运算5.(技能题)2234xyz·(-28zy)等于()A.6xyzB.-23384xyzyzC.-6xyzD.6x2yz6.(技能题)计算:23xx·22694xxx.题型2:分式的除法运算7.(技能题)22abcd÷34axcd等于()A.223bxB.32b2xC.-223bxD.-222238abxcd8.(技能题)计算:23aa÷22469aaa.课后系统练基础能力题9.(-3ab)÷6ab的结果是()A.-8a2B.-2abC.-218abD.-212b10.-3xy÷223yx的值等于()A.-292xyB.-2y2C.-229yxD.-2x2y211.若x等于它的倒数,则263xxx÷2356xxx的值是()A.-3B.-2C.-1D.012.计算:(xy-x2)·xyxy=________.13.将分式22xxx化简得1xx,则x应满足的条件是________.14.下列公式中是最简分式的是()A.21227baB.22()abbaC.22xyxyD.22xyxy15.计算(1)(2)(1)(2)aaaa·5(a+1)2的结果是()A.5a2-1B.5a2-5C.5a2+10a+5D.a2+2a+116.(2005·南京市)计算22121aaa÷21aaa.17.已知1m+1n=1mn,则nm+mn等于()A.1B.-1C.0D.2拓展创新题18.(巧解题)已知x2-5x-1997=0,则代数式32(2)(1)12xxx的值是()A.1999B.2000C.2001D.200219.(学科综合题)使代数式33xx÷24xx有意义的x的值是()A.x≠3且x≠-2B.x≠3且x≠4C.x≠3且x≠-3D.x≠-2且x≠3且x≠420.(数学与生活)王强到超市买了a千克香蕉,用了m元钱,又买了b千克鲜橙,也用了m元钱,若他要买3千克香蕉2千克鲜橙,共需多少钱?(列代数式表示).答案1.(1)14(2)34(3)48a2b(4)4a2b2+4ab3(5)2a2+ab-3b22.(1)44aa(2)xyzxyz3.分数与分数相乘,把分子、分母分别相乘;除以一个数等于乘以这个数的倒数4.分式乘以分式,把分子、分母分别相乘;除以一个分式等于乘以这个分式的倒数5.C6.32xx7.C8.32aa9.D10.A11.A12.-x2y13.x≠014.C15.B16.1a17.B18.C19.D20.(3ma+2mb)元