Пошаговое объяснение:
1) -7 +(-8)= -7-8=-(7+8)=-15
2) -0,38 +(-0,74)= -0,38-0,74=-(0,38+0,74)=-1,12
3) -1,8 + (-0,34)= -1,8 -0,34=-(1,8+0,34)=- 2,14
4)
5)
6)
Пошаговое объяснение:
1) -7 +(-8)= -7-8=-(7+8)=-15
2) -0,38 +(-0,74)= -0,38-0,74=-(0,38+0,74)=-1,12
3) -1,8 + (-0,34)= -1,8 -0,34=-(1,8+0,34)=- 2,14
4)![-\frac{46}{7}+\frac{23}{7}=\frac{-46+23}{7}=-\frac{23}{7}=-3\frac{2}{7}](/tpl/images/0703/9598/91fd4.png)
5)![-\frac{5}{6} +(-\frac{7}{8})= -(\frac{5}{6}+\frac{7}{8})=-(\frac{5*4+7*3}{24})=-(\frac{20+21}{24} )=-\frac{42}{24}=-1 \frac{18}{24}=-1 \frac{3}{4}](/tpl/images/0703/9598/f75ae.png)
6)![-\frac{67}{15}+(-\frac{83}{10})= -(\frac{67}{15}+\frac{83}{10})=-(\frac{67*2+83*3}{30})= -(\frac{134+249}{30})=-\frac{383}{30}=-12 \frac{23}{30}](/tpl/images/0703/9598/0ba97.png)