Question

пожалуйста 45*3+x=216 второе 150/x=750/50 тритье [56+104]/x=16

Answer 1

$45 \times 3 + x = 216 \\ 135 + x = 216 \\ x = 216 - 135 \\ x = 81$
$\frac{150}{x} = \frac{750}{50} \\ 150 \times 50 = 750x \\ 7500 = 750x \\ x = 7500 \div 750 \\ x = 10$
$\frac{56 + 104}{x} = 16 \\ \frac{160}{x} = 16 \\ x = 160 \div 16 \\ x = 10$