Выполни действия с выражениями из упражнений № 119, 120 и 121

Тренажёр № 119. Найти значение выражения при у = 1,3. 1) $2.7y - 0.4 + 1.7y = 2.7 * 1.3 - 0.4 + 1.7 * 1.3 = 3.51 - 0.4 + 2.21 = 5.32$ *Перевод:* 1) $2.7y - 0.4 + 1.7y = 2.7 * 1.3 - 0.4 + 1.7 * 1.3 = 3.51 - 0.4 + 2.21 = 5.32$ 2) $8.78 - y + 1.2 = 8.78 - 1.3 + 1.2 = 8.78 + 1.2 - 1.3 = 9.98 - 1.3 = 8.68$ *Перевод:* 2) $8.78 - y + 1.2 = 8.78 - 1.3 + 1.2 = 8.78 + 1.2 - 1.3 = 9.98 - 1.3 = 8.68$ 3) $y - y + y - 0.3 = 1.3 - 1.3 + 1.3 - 0.3 = 0 + 1.3 - 0.3 = 1$ *Перевод:* 3) $y - y + y - 0.3 = 1.3 - 1.3 + 1.3 - 0.3 = 0 + 1.3 - 0.3 = 1$ 4) $3.6y + 1.4y - 5y = 3.6 * 1.3 + 1.4 * 1.3 - 5 * 1.3 = 4.68 + 1.82 - 6.5 = 6.5 - 6.5 = 0$ *Перевод:* 4) $3.6y + 1.4y - 5y = 3.6 * 1.3 + 1.4 * 1.3 - 5 * 1.3 = 4.68 + 1.82 - 6.5 = 6.5 - 6.5 = 0$ 5) $12.3 + y - 2.4 = 12.3 + 1.3 - 2.4 = 13.6 - 2.4 = 11.2$ *Перевод:* 5) $12.3 + y - 2.4 = 12.3 + 1.3 - 2.4 = 13.6 - 2.4 = 11.2$ 6) $\frac{3}{5}y + 5.3y - 6.3y = \frac{3}{5}*1.3 + 5.3 * 1.3 - 6.3 * 1.3 = 0.6 * 1.3 + 5.3 * 1.3 - 6.3 * 1.3 = 0.78 + 6.89 - 8.19 = 7.67 - 8.19 = -0.52$ *Перевод:* 6) $\frac{3}{5}y + 5.3y - 6.3y = \frac{3}{5}*1.3 + 5.3 * 1.3 - 6.3 * 1.3 = 0.6 * 1.3 + 5.3 * 1.3 - 6.3 * 1.3 = 0.78 + 6.89 - 8.19 = 7.67 - 8.19 = -0.52$ 7) $\frac{4}{7}y - 1.2 + 1.1 = \frac{4}{7}*1.3 - 1.2 + 1.1 = \frac{4}{7}*1.3 - 0.1 = \frac{5.2}{7} - 0.1 \approx 0.74 - 0.1 = 0.64$ *Перевод:* 7) $\frac{4}{7}y - 1.2 + 1.1 = \frac{4}{7}*1.3 - 1.2 + 1.1 = \frac{4}{7}*1.3 - 0.1 = \frac{5.2}{7} - 0.1 \approx 0.74 - 0.1 = 0.64$ 8) $2\frac{1}{2} * 2.13 + y - 3.43 = 2.5 * 2.13 + 1.3 - 3.43 = 5.325 + 1.3 - 3.43 = 6.625 - 3.43 = 3.195$ *Перевод:* 8) $2\frac{1}{2} * 2.13 + y - 3.43 = 2.5 * 2.13 + 1.3 - 3.43 = 5.325 + 1.3 - 3.43 = 6.625 - 3.43 = 3.195$ 9) $34.98 - y - 0.08 = 34.98 - 1.3 - 0.08 = 34.98 - 1.38 = 33.6$ *Перевод:* 9) $34.98 - y - 0.08 = 34.98 - 1.3 - 0.08 = 34.98 - 1.38 = 33.6$ 10) $y - 0.25 = 1.3 - 0.25 = 1.05$ *Перевод:* 10) $y - 0.25 = 1.3 - 0.25 = 1.05$ Тренажёр № 120. Выполнить действия удобным способом. 1) $2.3 + 4.5 - 1.6 = 6.8 - 1.6 = 5.2$ *Перевод:* 1) $2.3 + 4.5 - 1.6 = 6.8 - 1.6 = 5.2$ 2) $8.34 - 2.04 + 2.5 = 8.34 + 2.5 - 2.04 = 10.84 - 2.04 = 8.8$ *Перевод:* 2) $8.34 - 2.04 + 2.5 = 8.34 + 2.5 - 2.04 = 10.84 - 2.04 = 8.8$ 3) $45.98 - 0.78 - 0.2 = 45.98 - (0.78 + 0.2) = 45.98 - 0.98 = 45$ *Перевод:* 3) $45.98 - 0.78 - 0.2 = 45.98 - (0.78 + 0.2) = 45.98 - 0.98 = 45$ 4) $6.5 + 1.5 - 2.9 = 8 - 2.9 = 5.1$ *Перевод:* 4) $6.5 + 1.5 - 2.9 = 8 - 2.9 = 5.1$ 5) $3.4 + 6.6 - 6.9 = 10 - 6.9 = 3.1$ *Перевод:* 5) $3.4 + 6.6 - 6.9 = 10 - 6.9 = 3.1$ 6) $\frac{3}{5} - 4.8 + 0.7 = 0.6 - 4.8 + 0.7 = 1.3 - 4.8 = -3.5$ *Перевод:* 6) $\frac{3}{5} - 4.8 + 0.7 = 0.6 - 4.8 + 0.7 = 1.3 - 4.8 = -3.5$ 7) $\frac{4}{5} * 12.8 + 4.67 - 2.8 = 0.8 * 12.8 + 4.67 - 2.8 = 10.24 + 4.67 - 2.8 = 14.91 - 2.8 = 12.11$ *Перевод:* 7) $\frac{4}{5} * 12.8 + 4.67 - 2.8 = 0.8 * 12.8 + 4.67 - 2.8 = 10.24 + 4.67 - 2.8 = 14.91 - 2.8 = 12.11$ 8) $2\frac{1}{2} * 7.451 - 7.251 + 0.8 = 2.5 * 7.451 - 7.251 + 0.8 = 18.6275 - 7.251 + 0.8 = 11.3765 + 0.8 = 12.1765$ *Перевод:* 8) $2\frac{1}{2} * 7.451 - 7.251 + 0.8 = 2.5 * 7.451 - 7.251 + 0.8 = 18.6275 - 7.251 + 0.8 = 11.3765 + 0.8 = 12.1765$ 9) $48.67 + 3.91 - 7.67 = 52.58 - 7.67 = 44.91$ *Перевод:* 9) $48.67 + 3.91 - 7.67 = 52.58 - 7.67 = 44.91$ 10) $123.8 + 34.76 - 4.76 = 123.8 + 30 = 153.8$ *Перевод:* 10) $123.8 + 34.76 - 4.76 = 123.8 + 30 = 153.8$ Тренажёр № 121. Выполнить умножение. 1) $2.5 * 3 = 7.5$ *Перевод:* 1) $2.5 * 3 = 7.5$ 2) $3.3 * 2 = 6.6$ *Перевод:* 2) $3.3 * 2 = 6.6$ 3) $1.2 * 4 = 4.8$ *Перевод:* 3) $1.2 * 4 = 4.8$ 4) $5 * 0.1 = 0.5$ *Перевод:* 4) $5 * 0.1 = 0.5$