15 câu Trắc nghiệm Toán 7 Chân trời sáng tạo Bài 1: Tỉ lệ thức - Dãy tỉ số bằng nhau có đáp án

A. ad=bc;

B. \[\frac{a}{c}=\frac{b}{d}\];

C. $\frac{c}{a}=\frac{b}{d}$;

D. $\frac{b}{a}=\frac{d}{c}$.

A. 1;           

B. −1;

C. 6;           

D. 3.

A. −10;      

B. −4;         

C. 10;         

D. 4.

A. $\frac{x}{3}=\frac{y}{-2}$;                  

B. $\frac{x}{y}=\frac{3}{-2}$;

C. $\frac{x}{-2}=\frac{y}{3}$;         

D. $\frac{3}{x}=\frac{2}{-y}$.

A. $\frac{a}{b}=\frac{c}{d}=\frac{a+c}{b+d}=\frac{a-c}{d-b}$;              

B. $\frac{a}{b}=\frac{c}{d}=\frac{a-c}{b-d}=\frac{c-a}{b-d}$;                

C. $\frac{a}{b}=\frac{c}{d}=\frac{a+c}{b+d}=\frac{a-c}{b-d}$;      

D. $\frac{a}{b}=\frac{c}{d}=\frac{a+c}{b-d}$.

A. x = −9; y = −15;

B. x = 9; y = 15;

C. x = −9; y = 15;

D. x = 9; y = 15.

A. x = 8; y = 14;            

B. x = −8; y = 14;          

C. x = 8; y = −14;          

D. x = −8; y = −14.        

A. x = 4; y = 6;

B. x = 6; y = 4;

C. x = −4; y = −6;

D. x = −6; y = −4.

A. x = 21; y = 6;

B. x = −6; y = 21;

C. x = 6; y = −21;

D. x = 6; y = 21.

A. $\frac{a}{b}=\frac{c}{d}=\frac{m}{n}=\frac{a+c+m}{b+d+n}$;          

B. $\frac{a}{b}=\frac{c}{d}=\frac{m}{n}=\frac{a+c-m}{b+n-d}$;            

C. $\frac{a}{b}=\frac{c}{d}=\frac{m}{n}=\frac{a+2c+m}{b+2d+n}$;                

D. $\frac{a}{b}=\frac{c}{d}=\frac{m}{n}=\frac{a-c-m}{b-d-n}$.

A. 10;         

B. −6;         

C. −10;          

D. −4.

A. 4;           

B. 6;   

C. 8;   

D. −6.

A. x = 6; y = 10;

B. x = 10; y = 6;

C. x = −6; y = −10;

D. x = −10; y = −6.

A. 80;         

B. 640;          

C. 320;          

D. 160.