Question

640. Вычислите: 1) 3/8*(-4)+5; 2)5/9:(-1/3)-7; 3) 2/5*(-3)-4/5; 4) 5/12:1/4-(-1/3) 5) (1/2*(-4)-5; 6) 4/9:(-2/3)+1.​

Answer 1

Ответ:

1) 3,5

2) -8 2/3

3) -2

4) 2

5) -7

6) 1 2/3

Answer 2

Sure, let's compute the expressions step by step:

1. $\frac{3}{8} \times (-4) + 5$ $= -\frac{12}{8} + 5$ $= -\frac{3}{2} + \frac{10}{2}$ $= \frac{7}{2}$

2. $\frac{5}{9} \div (-\frac{1}{3}) - 7$ $= \frac{5}{9} \times (-3) - 7$ $= -\frac{15}{9} - \frac{63}{9}$ $= -\frac{78}{9}$ $= -\frac{26}{3}$

3. $\frac{2}{5} \times (-3) - \frac{4}{5}$ $= -\frac{6}{5} - \frac{4}{5}$ $= -\frac{10}{5}$ $= -2$

4. $\frac{5}{12} \div \frac{1}{4} - (-\frac{1}{3})$ $= \frac{5}{12} \times 4 - (-\frac{1}{3})$ $= \frac{5}{3} - (-\frac{1}{3})$ $= \frac{5}{3} + \frac{1}{3}$ $= \frac{6}{3}$ $= 2$

5. $\frac{1}{2} \times (-4) - 5$ $= -\frac{4}{2} - 5$ $= -2 - 5$ $= -7$

6. $\frac{4}{9} \div (-\frac{2}{3}) + 1$ $= \frac{4}{9} \times (-\frac{3}{2}) + 1$ $= -\frac{12}{18} + 1$ $= -\frac{2}{3} + \frac{18}{18}$ $= \frac{16}{18}$ $= \frac{8}{9}$