Question

tìm x

3x/2= 49/30

3x/2= -61/30

Answer 1

\(\frac{3x}{2}=\frac{49}{30}\)

3x = 49/15

x = 49/45

b) \(\frac{3x}{2}=-\frac{61}{30}\)

3x = -61/15

x = -61/45

Answer 2

\(\frac{3x}{2}=\frac{49}{30}\Rightarrow3x=\frac{49.2}{30}=\frac{49}{15}\Rightarrow x=\frac{49}{45}\)

\(\frac{3x}{2}=\frac{-61}{30}\Rightarrow3x=\frac{\left(-61\right).2}{30}=\frac{-61}{15}\Rightarrow x=\frac{-61}{45}\)

Answer 3

a. \(\frac{3x}{2}=\frac{49}{30}\)

<=> 3x . 30 = 2 . 49

<=> 90x      = 98

<=> x          = 98 : 90

<=> x          = \(\frac{49}{45}\)

b. \(\frac{3x}{2}=-\frac{61}{30}\)

<=> 3x . 30 = - 61 . 2

<=> 90x      = -122

<=> x          = -122 : 90

<=> x          = \(-\frac{61}{45}\)

Answer 4

\(\frac{3x}{2}=\frac{49}{30}\)

\(\Leftrightarrow3x.30=2.49\)

\(\Leftrightarrow90x=98\)

\(\Leftrightarrow x=\frac{49}{45}\)

\(\frac{3x}{2}=\frac{-61}{30}\)

\(\Leftrightarrow3x.30=-61.2\)

\(\Leftrightarrow90x=-122\)

\(\Leftrightarrow90x=\frac{-61}{45}\)