Question

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Answer 1

Пошаговое объяснение:

Д)

1)

$0.4 \div y = 2 \div 9$

$\frac{0.4}{y} = \frac{2}{9}$

$0.4 \times 9 = 2y$

$2y = 3.6$

$y = \frac{3.6}{2}$

$y = 1.8$

2).

$13 \div 15 = 2.6 \div x$

$\frac{13}{15} = \frac{2.6}{x}$

$13x = 2.6 \times 15$

$13x = 39$

$x = \frac{39}{13}$

$x = 3$

3).

$13 \div 20 = 2.6 \div a$

$\frac{13}{20} = \frac{2.6}{a}$

$13a = 20 \times 2.6$

$13a = 52$

$a = \frac{52}{13}$

$a = 4$

4).

$3.3 \div b = 11 \div 30$

$\frac{3.3}{b} = \frac{11}{30}$

$3.3 \times 30 = 11b$

$11b = 99$

$b = \frac{99}{11}$

$b = 9$

Е).

1).

$\frac{x}{6} = \frac{5.1}{17}$

$17x = 5.1 \times 6$

$17x = 30.6$

$x = \frac{30.6}{17}$

$x = \frac{306}{170}$

$x = 1.8$

2).

$\frac{13}{x} = \frac{7}{1.4}$

$13 \times 1.4 = 7x$

$7x = 18.2$

$x = \frac{18.2}{7}$

$x = \frac{182}{70}$

$x = 2.6$

3).

$14 \div 9 = y \div 1.8$

$\frac{14}{9} = \frac{y}{1.8}$

$14 \times 1.8 = 9y$

$9y = 25.2$

$y = \frac{25.2}{9}$

$y = \frac{252}{90}$

$y = 2.8$

4).

$c \div 1.8 = 11 \div 6$

$\frac{c}{1.8} = \frac{11}{6}$

$6c = 1.8 \times 11$

$6c = 19.8$

$c = \frac{19.8}{6}$

$c = \frac{198}{60}$

$c = 3.3$

Ж).

1).

$6 \div 7 = x \div 0.7$

$\frac{6}{7} = \frac{x}{0.7}$

$7x = 6 \times 0.7$

$7x = 4.2$

$x = \frac{4.2}{7}$

$x = \frac{42}{70}$

$x = 0.6$

2).

$\frac{11}{5.5} = \frac{16}{c}$

$11c = 16 \times 5.5$

$11c = 88$

$c = \frac{88}{11}$

$c = 8$

3).

$\frac{3.8}{19} = \frac{y}{3}$

$3.8 \times 3 = 19y$

$19y = 11.4$

$y = \frac{11.4}{19}$

$y = \frac{114}{190}$

$y = 0.6$

4).

$\frac{16}{y} = \frac{9}{3.6}$

$16 \times 3.6 = 9y$

$9y = 57.6$

$y = \frac{57.6}{9}$

$y = \frac{576}{90}$

$y = 6.4$

З).

1).

$\frac{5.4}{18} = \frac{b}{7}$

$5.4 \times 7 = 18b$

$18b = 37.8$

$b = \frac{37.8}{18}$

$b = \frac{378}{18}$

$b = 2.1$

2).

$a \div 0.5 = 7 \div 5$

$\frac{a}{0.5} = \frac{7}{5}$

$5a = 7 \times 0.5$

$5a = 3.5$

$a = \frac{3.5}{5}$

$a = \frac{35}{50}$

$a = 0.7$

3).

$\frac{a}{13} = \frac{3.2}{14}$

$14a = 3.2 \times 13$

$14a = 41.6$

$a = \frac{41.6}{14}$

$a = \frac{416}{140}$

$a = \frac{104}{35}$

4) .

$\frac{11}{3.3} = \frac{14}{a}$

$11a = 14 \times 3.3$

$11a = 46.2$

$a = \frac{462}{110}$

$a = 4 \frac{5}{11}$

$a = 4.2$