Question

4/25+x/13= 0,76 

15. x +15 . 2,7= 105

giúp add cộng k

Answer 1

4/25 + x/13 =0,76

=> x/13 = 0,76 -4/25

=> x/13 = 0,6

=> x      = 0,6 x 13 

=> x      = 7,8

Answer 2

\(\frac{4}{25}+\frac{x}{13}=0,76\Leftrightarrow\frac{x}{13}=\frac{19}{25}-\frac{4}{25}=\frac{3}{5}\Leftrightarrow x=\frac{3.13}{5}=\frac{39}{5}\)

\(15.x+15.2,7=105\Leftrightarrow15.\left(x+2,7\right)=105\Leftrightarrow x+2,7=7\Leftrightarrow x=7-2,7=4,3\)