1. Вычислить: 3,72 + 2/5; 0,6 − 4/9; −3/7 + 0,5; 0,12 · 1/15; (−1 1/6) : 1,4; 5 · (−3)³ + 7; (9,885 − 0,365) : 1,7 + 4,4.

Question

Вопрос:

Accepted Answer

1) \(3{,}72+\frac{2}{5}=3{,}72+0{,}4=4{,}12\).

2) \(0{,}6-\frac{4}{9}=\frac{3}{5}-\frac{4}{9}=\frac{27-20}{45}=\frac{7}{45}\).

3) \(-\frac{3}{7}+0{,}5=-\frac{3}{7}+\frac{1}{2}=\frac{-6+7}{14}=\frac{1}{14}\).

4) \(0{,}12\cdot\frac{1}{15}=\frac{12}{100}\cdot\frac{1}{15}=\frac{1}{125}=0{,}008\).

5) \(\left(-1\frac{1}{6}\right):1{,}4=-\frac{7}{6}:\frac{7}{5}=-\frac{7}{6}\cdot\frac{5}{7}=-\frac{5}{6}\).

6) \(5\cdot(-3)^3+7=5\cdot(-27)+7=-135+7=-128\).

7) \((9{,}885-0{,}365):1{,}7+4{,}4=9{,}52:1{,}7+4{,}4=5{,}6+4{,}4=10\).

Ответ: 4,12; 7/45; 1/14; 0,008; −5/6; −128; 10.