Trắc nghiệm Toán 7 Bài 7 (có đáp án): Tỉ lệ thức !...

A. a = c

B. a.c = b.d

C. a.d = b.c

D. b = d

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

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

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

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

A. $\frac{5}{35} = \frac{35}{63}$

B. $\frac{63}{9} = \frac{35}{5}$

C. $\frac{35}{9} = \frac{63}{5}$

D. $\frac{63}{35} = \frac{9}{5}$

A. $\frac{- 5}{15} = \frac{7}{- 21}$

B. $\frac{- 21}{7} = \frac{15}{- 5}$

C. $\frac{15}{7} = \frac{- 5}{- 21}$

D. $\frac{- 21}{15} = \frac{7}{- 5}$

A. $\frac{7}{12} v à \frac{5}{6} : \frac{4}{3}$

B. $\frac{6}{7} : \frac{14}{5} v à \frac{7}{3} : \frac{2}{9}$

C. $\frac{15}{21} v à \frac{- 125}{175}$

D. $\frac{- 1}{3} v à \frac{- 19}{57}$

A. $\frac{1}{4} : \frac{1}{9} v à \frac{1}{2} : \frac{2}{9}$

B. $\frac{3}{5} : \frac{1}{7} v à 21 : \frac{1}{5}$

C. $\frac{2}{7} : \frac{4}{11} v à \frac{7}{2} : \frac{4}{11}$

D. $\frac{5}{4} v à \frac{- 10}{12}$

A. $\frac{5}{15} = \frac{- 9}{- 27}; \frac{15}{5} = \frac{- 27}{- 9}; \frac{5}{- 9} = \frac{15}{- 27}; \frac{- 9}{5} = \frac{- 27}{15}$

B. $\frac{5}{15} = \frac{- 9}{- 27}; \frac{15}{5} = \frac{- 27}{- 9}; \frac{5}{- 9} = \frac{15}{- 27}; \frac{- 9}{5} = \frac{- 15}{27}$

C. $\frac{5}{15} = \frac{- 9}{- 27}; \frac{15}{5} = \frac{- 27}{9}$

D. $\frac{5}{15} = \frac{9}{27}; \frac{15}{5} = \frac{- 27}{- 9}; \frac{5}{- 9} = \frac{15}{- 27}; \frac{- 9}{5} = \frac{- 15}{27}$

A. $\frac{4, 5}{- 9} = \frac{5}{- 10}; \frac{- 10}{- 9} = \frac{5}{4, 5}; \frac{4, 5}{5} = \frac{- 9}{- 10}; \frac{- 10}{5} = \frac{- 9}{4, 5}$

B. $\frac{4, 5}{- 9} = \frac{5}{- 10}; \frac{- 10}{- 9} = \frac{5}{4, 5}; \frac{5}{4, 5} = \frac{- 9}{- 10}; \frac{- 10}{5} = \frac{- 9}{4, 5}$

C. $\frac{4, 5}{- 9} = \frac{5}{- 10}; \frac{- 10}{- 9} = \frac{5}{4, 5}; \frac{4, 5}{5} = \frac{- 9}{10}$

D. $\frac{4, 5}{- 9} = \frac{5}{- 10}; \frac{- 10}{- 9} = \frac{5}{4, 5}; \frac{4, 5}{5} = \frac{- 9}{- 10}; \frac{- 10}{4, 5} = \frac{- 9}{5}$

A. $\frac{- 3}{y} = \frac{x}{7}$

B. $\frac{- 3}{x} = \frac{7}{y}$

C. $\frac{y}{7} = \frac{- 3}{x}$

D. $\frac{7}{- 3} = \frac{x}{y}$

A. $\frac{2}{a} = \frac{5}{b}$

B. $\frac{b}{5} = \frac{2}{a}$

C. $\frac{2}{5} = \frac{a}{b}$

D. $\frac{2}{b} = \frac{5}{a}$

A. x = $\frac{1}{5}$

B. x = $\frac{- 5}{4}$

C. x = $\frac{5}{4}$

D. x = $\frac{4}{5}$

A. x = $\frac{- 6}{5}$

B. x = $\frac{11}{10}$

C. x = $\frac{- 11}{10}$

D. x = $\frac{6}{5}$

A. x = $\frac{1}{5}$

B. x = 5

C. x = $\frac{1}{3}$

D. x = 3

A. x = 25

B. x = 5

C. x = $\frac{1}{25}$

D. x = 35

A. x = $\frac{- 4}{3}$

B. x = 4

C. x = -12

D. x = -10

A. x = $\frac{- 21}{5}$

B. x = -102

C. x = -105

D. x = $\frac{21}{5}$