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Khởi động (phép trừ hai phân thức)

Total questions: 8

Worksheet time: 5mins

Name
Class
Date
1.

2xx2−8x+16,6x3x2−12x\frac{2x}{x^2-8x+16},\frac{6x}{3x^2-12x}  có mẫu thức chung là:

a)

3x(x−4)3x\left(x-4\right)  

b)

3x(x−4)23x\left(x-4\right)^2  

c)

x−4x-4  

d)

(x−4)2\left(x-4\right)^2  

2.

Ma^~u thức chung của 10x+2,52x−4,13x−6Mẫu\ thức\ chung\ của\ \frac{10}{x+2},\frac{5}{2x-4},\frac{1}{3x-6}  là ...

a)

6(x+2)(x-2)

b)

3(x+2)(x-2)

c)

4(x+2)(x-2)

d)

(x+2)(x-2)

3.

x+1x−2−2xx−2=\frac{x+1}{x-2}-\frac{2x}{x-2}=  

a)

x−1x−2\frac{x-1}{x-2}  

b)

1−xx−2\frac{1-x}{x-2}  

c)

12\frac{1}{2}  

d)

−12-\frac{1}{2}  

4.

5x−2;20x2−4\frac{5}{x-2};\frac{20}{x^2-4}  có mẫu thức chung là

a)

(x−2)(x−2)\left(x-2\right)\left(x-2\right)  

b)

(x+2)(x−2)\left(x+2\right)\left(x-2\right)  

c)

x2−2x^2-2  

d)

(x−2)2\left(x-2\right)^2  

5.

Chọn khẳng định đúng:

a)

XY=−XY\frac{X}{Y}=\frac{-X}{Y}  

b)

XY=−X−Y\frac{X}{Y}=\frac{-X}{-Y}  

c)

XY=X−Y\frac{X}{Y}=\frac{X}{-Y}  

d)

XY=−XY\frac{X}{Y}=-\frac{X}{Y}

6.

4x2x−1−22x−1=\frac{4x}{2x-1}-\frac{2}{2x-1}=  

a)

4x+22x−1\frac{4x+2}{2x-1}  

b)

22  

c)

−2-2  

d)

2−4x2x−1\frac{2-4x}{2x-1}  

7.

1x−1x+1=\frac{1}{x}-\frac{1}{x+1}=  

a)

1x\frac{1}{x}  

b)

1x(x+1)\frac{1}{x\left(x+1\right)}  

c)

2x+1x(x+1)\frac{2x+1}{x\left(x+1\right)}  

d)

1x+1\frac{1}{x+1}  

8.

1x+1+(−1x+1) =\frac{1}{x+1}+\left(-\frac{1}{x+1}\right)\ =  

(a)