3/5 : x = 4/7 3/8 : x/8 = 1/2

2 câu trả lời

$\dfrac{3}{5}$ : x = $\dfrac{4}{7}$

x = $\dfrac{3}{5}$ : $\dfrac{4}{7}$

x = $\dfrac{3}{5}$ x $\dfrac{7}{4}$

x = $\dfrac{21}{20}$

Vậy x = $\dfrac{21}{20}$

$\dfrac{3}{8}$ : $\dfrac{x}{8}$ = $\dfrac{1}{2}$

$\dfrac{x}{8}$ = $\dfrac{3}{8}$ : $\dfrac{1}{2}$

$\dfrac{x}{8}$ = $\dfrac{3}{8}$ x 2

$\dfrac{x}{8}$ = $\dfrac{6}{8}$

=> x = 6

Vậy x = 6.

Đáp án:

 

Giải thích các bước giải:

a)$\frac{3}{5}$:x= $\frac{4}{7}$ 

x=$\frac{3}{5}$:$\frac{4}{7}$

x=$\frac{21}{20}$

b)$\frac{3}{8}$:$\frac{x}{8}$=$\frac{1}{2}$ 

$\frac{x}{8}$=$\frac{3}{8}$:$\frac{1}{2}$

$\frac{x}{8}$=$\frac{3}{4}$

$\frac{x}{8}$=$\frac{6}{8}$

x=6

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