《第1课时分式的乘除1.docx》由会员分享,可在线阅读,更多相关《第1课时分式的乘除1.docx(5页珍藏版)》请在taowenge.com淘文阁网|工程机械CAD图纸|机械工程制图|CAD装配图下载|SolidWorks_CaTia_CAD_UG_PROE_设计图分享下载上搜索。
1、分式的乘除第1课时分式的乘除一.填空题1.约分:m2 +2m + l _ 1 -m22.计算:a3+11 Q + Q -2n+ aa2ab(n为正整数)(2c)4(加)2(-2)2 (-也)(士 b a abH .(号n2x y3c24)32/)J (孙一12) +x2-2xy + y2x2二.判断题下列运算正确的打“ J ”,错误的打“ x ”:1.2x y x+ y 2x + - =+1x+ y x+ y y x+ y2xx+ yx6 + Vz33.9 4工(.) z24.2nbF (n为正整数)()5.3a2)捺()三.选择题1.已知x:y = 3,则分式(:一打:的值是( x -yA-
2、 -IB.2726D.14132.在分式3x6xy2x + 2y22% 一y22x +y丁一工(xy)2 Y -2中,最简分.式有()A. 1个B. 2个C. 3个D.4个3.下列各式正确的是(B.22ax yA 22x + y x+ yx2 + 2x +1 x +1.22x x2 1 x 1aa + bC.=b 2bD.上7)2 a + bc2a2 +b2四.计算1.8x2(-3x4y3),(-6z)02.三)3.(/).)2 a + bb + a3.22a -x)no-(a + b)x + ab b - y4. 6x + 9-9 x + 3: x2 x 6%2 3x 10 2(x 5)5.
3、22x 6/ x + x 6+ (x + 3)4-4x + %23-x6.X1 + X +11 X3 2 cvi- + (厂 +x 2)X +11+ X7./ + 7 +10a + 6a + 54+1 a 6z +1 a2 + 4 + 4 + 28.=)2.(ab9.(2 -X2)3(a + 2ax + )44a -x(q2 (2X +a2 c2 2ab a2 / 一/ + 2bc10.- b2 + c、2 Zac + b2 + 2abLI.(x+y)2:町+ V孙一丁 (x-y)212.2 +型zuX1 y-x321 1-x + y3213.+ 2/ + x + 2 4x + 4+1:x +
4、 4x + 4 2x x + 2 x 114.216x2 4x + 412-4xx2-4+ (x + 2)01b2面4 2s_)lb. LJ1LJ3(。+ b) a22L6. (Si? 2Z?2) +4ab + 4ab+bl2b2 -5ah-3a2bb -5ab + 6a2,其中=L, b=-o 24答案1.m + 1i;a + i;,2. 44204c2.-1. ab427/b1.三.1.四.2.4.5.2.3. B1.解:原式=8X2.3%476z _ 36xz y42.27 r9解:原式=- (a-b)(a2 -vab + b2)-(a + b)(a + b)227(。- b)(a2 +
5、ah + b2 )x9(a + b)(Jb 4 )-3.解:原式二(y + a)(y + b)(4 + x)(Q-x)(x- a)(x-b) (b+ y)(b - y)(y + a)(x + a) _y + a)(x + a)(x-b)(b-y)(x-b)(y-b)4.解:原式=(x 3)(x + 2)(x 5)(x + 2)(x + 3)(x-3)x + 32(x-5) 25.解:原式=2(x-3) 1(x 2)2 x + 3(x + 3)(x 2)3-x6一解:原式=+ X + 1 (1 X)(%2 + X + 1)X2 +11 + x2(x + 2)(x-l)7.解:原式=( + 2)(
6、a + 5) (a+ 1)(+ 5)(a +1)(2 +1)(a + 2)28.解:原式=a2b2a3 _ a3(a + b)2 _ a(a + b)2 a-b)3 - a2b29.解:原式=(a + x)3(a-x)3(a2 + x2)(a + x)(a x)22cr +x(a + x)4(0 7)4 Jin到百卜(a b + c)(a b c)10,. 解:原式=(a + h c)( - b c)(a + b + c)(a + b-c) _ a + b + c(a + h c)(6z /? + c) a + b c(x+y)(x y)11.解:原式二任+y._(x_y) = _y(x -
7、y)y (x+y)12.2x + 3y解:原式二个一勺2x-3yx2x-3y62x + 3y62x + 3y 2x-3y (=12x-3y 2x + 3y13.解:原式=(x + 2) + (x + 2)(x + 2)2(x-2)2 (x + l)(x 1) %2(x 2) (x 2) +114.解.:原式=3.(x + 2)(x-2),=.8(九一2)24(3 - x) x + 22(3 - x)(x - 2)15.解:原式二一01b23(+ 力( + 34(348_ 8(+ 3362(4 3a2 a6(b-a)33a216.解:原式=2(2+ 6)(2-/?)(2b + ab - 2a)b(2a + bl? (b一 2a)(b一 3a)当。=一- , 6 =时,原一式=一2x(一) + 4x J 寸L=2x(-) + 24代数式的值为0