Question

Кто спам того в бан, ну пж помогите

Answer 1

3)25-х:1,5=4,2

х:1,5=25-4,2

х:1,5=20,8

х=20,8•1,5

х=31,2

4)144:х-7,6=82,4

144:х=82,4+7,6

144:х=90

х=144:90

х=1,6

Answer 2

$3) \: 25 - x \div 1.5 = 4.2 \\ - x \div 1.5 = 4.2 - 25 \\ - x \div 1.5 = - 20.8 \: | \times ( - 1) \\ x \div 1.5 = 20.8 \\ x = 20.8 \times 1.5 = \frac{104}{5} \times \frac{3}{2} \\ x = \frac{312}{10} = 31.2$

$4)144 \div x - 7.6 = 82.4 \\ 144 \div x = 82.4 + 7.6 \\ 144 \div x = 90 \\ 144 = 90x \\ x = \frac{144}{90} = \frac{18 \times 8}{18 \times 5} = \frac{8}{5 } \\ x = 1 \frac{3}{5}$