专题9 分式的混合运算-【精彩练习】2023-2024学年七年级下册数学同步评价作业教师用书配套Word（浙教版）

学科网书城 品牌书店·知名教辅·正版资源 b.zxxk.com 您身边的互联网+教辅专家 专题9 分式的混合运算(见学生用书P35) 计算. (1)avs4alcol(f(11a-2)a2-4a )avs4alcolCf22a-3a2-I-Ia-1 (3x-2x+1alvs4allcol(1+(2x+5x2-4) (4x-1x2-2x+1-avs4allcolfix2+x- 1x-1)-x-1 (5)avs4allcol(y-f(2xy-x2y)-x2-y2y (6)aa2-4-alvs4allcol(1-f(2a+2)) $7x2-6x+9aìvs4allcol(f(33-x)-1) (8)lalvs4allcol(x+1-f3x-1))x2-4x+ 4-1. 解:(1)原式=la+2:(a+2)(a-2)a+la-2:(a+2)(a-2)a -a-2a+a+2a-2 (2)原式-f(2(a-1)2a-3(a+1)(a-1))(a-1 =2(a-1)-2a+3(a+1)(a-I)(a-1)=2a-2-2a+3(a+l)(a-I)(a-1)=la+l (3)原式=x-2x+1x2-4+2x+5x2-4=x-2x+1(+1)2[+2)(-2)=x+1x+$ (4)原式-1x-1-x2+x-1-x2+lx-I-lx-Ix-1x-1x ($)原式=y2-2xy+x2y·y(+y)(x-y)=(-y)2y·y(x+y)(x-y)=x-x+y (原式=a(a+2)(a-2)+a+2-2a+2-a(a+2)(a-2)a+2a-la-2 (7)原式-(x-3)2x·avs4alcolf(33-x3-x)=(x-3)2x·x3-x=3-x (8)原式=avs4alcol(f(x2-13x-l-(x-2)2x-1=x2-4-1x-I(-2)2-(x+2 (x-2)x-1x-1(x-2)2-x+2x-2 独家授权侵权必究