Question

bài 10 : tìm số tự nhiên x biết :

a) 5/12=x/72

b) x+3/15=1/3

c) -2/9=x/72

Answer 1

sorry em ko biết

Answer 2

a) \(\frac{5}{12}=\frac{x}{72}\Rightarrow x=\frac{5.72}{12}=30\)

b)\(\frac{x+3}{15}=\frac{1}{3}\)

\(\Rightarrow x+3=\frac{15.1}{3}=5\)

\(\Rightarrow x=5-3=2\)

c)\(\frac{-2}{9}=\frac{x}{72}\Rightarrow x=\frac{-2.72}{9}=-16\)

Answer 3

a) 5/12=30/72

b) 2+3/15=1/3

c) -2/9=-16/72

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Ủng hộ mình nha các bạn !

Answer 4

a) x.12=5.72

x.12=360

x=360:12

x=30

b)(x+3).3=15.1

x+3=5

x=2

c)-2.72=9.x

-144:9=x

-16=x

Answer 5

\(a,\frac{5}{12}=\frac{x}{72}\Leftrightarrow5.72=12.x\Rightarrow x=\frac{5.72}{12}=\frac{360}{12}=30\)

Vậy x = 30

\(b,\frac{x+3}{15}=\frac{1}{3}\Leftrightarrow\left(x+3\right).3=15.1\Rightarrow x+3=\frac{15.1}{3}=5\Rightarrow x=2\)

Vậy x = 2

\(c,\frac{-2}{9}=\frac{x}{72}\Leftrightarrow\left(-2\right).72=9.x\Rightarrow x=\frac{\left(-2\right).72}{9}=\frac{-144}{9}=-16\)

Vậy x = - 16