Відповідь:
1) - 0,8
2) 15,87
3) 30,625
4) 8,88
Покрокове пояснення:
1) ![(0,6+\frac{2}{3})+(- 2\frac{1}{15})=(\frac{6}{10} +\frac{2}{3})+(- \frac{31}{15})=\frac{3}{5}+\frac{2}{3}- \frac{31}{15}= \frac{3*3}{5*3}+\frac{2*5}{3*5}- \frac{31*1}{15*1}= (0,6+\frac{2}{3})+(- 2\frac{1}{15})=(\frac{6}{10} +\frac{2}{3})+(- \frac{31}{15})=\frac{3}{5}+\frac{2}{3}- \frac{31}{15}= \frac{3*3}{5*3}+\frac{2*5}{3*5}- \frac{31*1}{15*1}=](https://tex.z-dn.net/?f=%280%2C6%2B%5Cfrac%7B2%7D%7B3%7D%29%2B%28-%202%5Cfrac%7B1%7D%7B15%7D%29%3D%28%5Cfrac%7B6%7D%7B10%7D%20%2B%5Cfrac%7B2%7D%7B3%7D%29%2B%28-%20%5Cfrac%7B31%7D%7B15%7D%29%3D%5Cfrac%7B3%7D%7B5%7D%2B%5Cfrac%7B2%7D%7B3%7D-%20%5Cfrac%7B31%7D%7B15%7D%3D%20%5Cfrac%7B3%2A3%7D%7B5%2A3%7D%2B%5Cfrac%7B2%2A5%7D%7B3%2A5%7D-%20%5Cfrac%7B31%2A1%7D%7B15%2A1%7D%3D)
![\frac{9}{15}+\frac{10}{15}- \frac{31}{15}= \frac{9+10-31}{15} =-\frac{12}{15} =-\frac{4}{5}=-0,8 \frac{9}{15}+\frac{10}{15}- \frac{31}{15}= \frac{9+10-31}{15} =-\frac{12}{15} =-\frac{4}{5}=-0,8](https://tex.z-dn.net/?f=%5Cfrac%7B9%7D%7B15%7D%2B%5Cfrac%7B10%7D%7B15%7D-%20%5Cfrac%7B31%7D%7B15%7D%3D%20%5Cfrac%7B9%2B10-31%7D%7B15%7D%20%3D-%5Cfrac%7B12%7D%7B15%7D%20%3D-%5Cfrac%7B4%7D%7B5%7D%3D-0%2C8)
2) –14,37 – 11,64 – (–23,85 –18,03)= –14,37 – 11,64 + 23,85 + 18,03=
(23,85 + 18,03) + (–14,37 – 11,64)=(23,85 + 18,03) + (–14,37 +(– 11,64))=
41,88+(–26,01)= 41,88–26,01=15,87
3) –4,9 : (–0,2•0,3 – 0,1).=–4,9 : (–0,06 – 0,1)=–4,9 : (–0,06+( – 0,1))=
–4,9 : (–0,16)=4,9:0,16=490:16=30,625
4) (–15,64:43/5+7,1)•2 2/5.
![(-15,64:4\frac{3}{5} +7,1)*2\frac{2}{5} =(-15,64:4,6+7,1)*2,4=(-3,4+7,1)*2,4= (-15,64:4\frac{3}{5} +7,1)*2\frac{2}{5} =(-15,64:4,6+7,1)*2,4=(-3,4+7,1)*2,4=](https://tex.z-dn.net/?f=%28-15%2C64%3A4%5Cfrac%7B3%7D%7B5%7D%20%2B7%2C1%29%2A2%5Cfrac%7B2%7D%7B5%7D%20%3D%28-15%2C64%3A4%2C6%2B7%2C1%29%2A2%2C4%3D%28-3%2C4%2B7%2C1%29%2A2%2C4%3D)
![3,7*2,4=8,88 3,7*2,4=8,88](https://tex.z-dn.net/?f=3%2C7%2A2%2C4%3D8%2C88)