Question

Решите 1) 1 1/5 - 2/15 2) 2 1/5 -5/8 3) 4,3+0,12 4) 3,6: 7,2 5) 0,5 +1/3 6)2 1/4 : 0,3 7) ) 8) (-4)*(-2)

Answer 1

1) 2 1/15
2) 1 23/40
3) 4,42
4) 0,5
5) 5/6
6) 7,5
7) 6
8) 8

Answer 2

$\frac{11}{5} - \frac{2}{15 } = \frac{33}{15} = \frac{11}{3} = 3 \times \frac{2}{3 } \\$

$2 \times \frac{1}{5} - \frac{5}{8} = 2 \times \frac{8}{40} - \frac{25}{40} = \frac{88}{40} - \frac{25}{40} = \frac{63}{40} = 1 \times \frac{23}{40}$
3) 4,3+0,12=4,42
4) 3,6:7,2=0,5
$0.5 + \frac{1}{3} = \frac{5}{10} + \frac{1}{3} = \frac{1}{2} + \frac{1}{3} = \frac{3}{6} + \frac{2}{6} = \frac{5}{6}$
$2 \times \frac{1}{4} \div 0.3 = \frac{9}{4} \div \frac{3}{10} = \frac{9}{4} \times \frac{10}{3 } = \frac{15}{2} = 7 \times \frac{1}{2}$
7)5-(-1)=6
8)(-4)(-2)=-6