Question

Решите пожалуйста с решением

Answer 1

$1) \: \frac{x}{12} = \frac{3}{4} \\ 4x = 12 \times 3 \\ 4x = 36 \\ x = \frac{36}{4} \\ x = 9$

$2) \: \frac{36}{2} = \frac{x}{5} \\ 2x = 36 \times 5 \\ 2x = 180 \\ x = \frac{180}{2} \\ x = 90$

$3) \: \frac{18}{x} = 5 \div 2 \\ \frac{18}{x} = \frac{5}{2} \\ 5x = 18 \times 2\\ 5 = 36 \\ x = \frac{36}{5} \\ x = 7.2$

$4) \: x \div 4 = \frac{9}{12} \\ \frac{x}{4} = \frac{9}{12} \\ 12x = 9 \times 4 \\ 12x = 36 \\ x = \frac{36}{12} \\ x = 3$

$5) \: \frac{x}{6} = \frac{9}{27} \\ 27x = 9 \times 6 \\ 27x = 54 \\ x = \frac{54}{27} \\ x = 2$

$6) \: \frac{x}{5.5} = \frac{100}{10} \\ 10x = 100 \times 5.5 \\ 10x = 550 \\ x = \frac{550}{10} \\ x = 55$

$7) \: 9.9 \div x = 66 \div 2 \\ \frac{99}{x} = \frac{66}{2} \\ 66x = 99 \times 2 \\ 66x = 198 \\ x = \frac{198}{66} \\ x = 3$

$8) \: \frac{40}{2} = \frac{x}{1.5} \\ 2x = 40 \times 1.5 \\ 2x = 60 \\ x = \frac{60}{2} \\ x = 30$

$9) \: \frac{8.1}{0.9} = \frac{3.6}{x} \\ 8.1x = 3.6 \times 0.9 \\ 8.1x = 3.24 \\ x = \frac{3.24}{8.1} \\ x = 0.4$

$10) \: 25 \div 2 = \frac{x}{4} \\ \frac{25}{2} = \frac{x}{4} \\ 2x = 25 \times 4 \\ 2x = 100 \\ x = \frac{100}{2} \\ x = 50$