Question

1) 9 + (-1 1/2)=
2) 8 + (-2 5/7)=
3) 5 + (-6 2/3)=
4) -4 2/5 + 3,4=
5) -9,75 +2 3/4=
6) -6,5 +3 1/2=
7) 4 1/2 + (-3)=
8) 7 2/3 + (-9)=
9) 2 4/5 + (-6)=

Answer 1

Пошаговое объяснение:

$1)9+(-1\frac{1}{2})=8\frac{2}{2}-1\frac{1}{2}=7\frac{1}{2}\\ \\ 2)8+(-2\frac{5}{7})=7\frac{7}{7}-2\frac{5}{7}=5\frac{5}{7} \\ \\ 3)5+(-6\frac{2}{3})=-(6\frac{2}{3}-5)=-1\frac{2}{3} \\\\ 4)-4\frac{2}{5}+3,4=-4,4+3,4=-1\\ \\5)-9,75+2\frac{3}{4}=-9,75+2,75=-7 \\ \\ 6)-6,5+3\frac{1}{2}=-6,5+3,5=-(6,5-3,5)=-3\\ \\7)4\frac{1}{2}+(-3)=4\frac{1}{2}-3=1\frac{1}{2} \\ \\ 8)7\frac{2}{3}+(-9)=-(8\frac{3}{3}-7\frac{2}{3})=-1\frac{1}{3} \\ \\ 9)2\frac{4}{5}+(-6)=-(5\frac{5}{5} -2\frac{4}{5})=-3\frac{1}{5}=-3,2$