Question

Найдите сумму: 1)-6+(-10) 2)-0,84+(-0,28) 3)0,68+(-1,6) 4)-5 7/9+(-2 4/9) 5)- 2/9 + (- 1/12) 6)-8 2/15+(-7 1/18)

Answer 1

$1) -6+(-10)=-(6+10)=-16$

$2)-0,84+(-0,28)=-(0,84+0,28)=-1,12$

$3)0,68+(-1,6)=0,68-1,6=-0,92$

$4)-5\tt\displaystyle\frac{7}{9}+(-2\frac{4}{9})=-(5\frac{7}{9}+2\frac{4}{9})=-7\frac{11}{9}=-8\frac{2}{9}\\\\$

$5)-\tt\displaystyle\frac{2}{9}+(-\frac{1}{12})=-(\frac{2*4}{9*4}+\frac{1*3}{12*3})=-(\frac{8}{36}+\frac{3}{36})=-\frac{11}{36}\\\\$

$6)-8\tt\displaystyle\frac{2}{15}+(-7\frac{1}{18})=-(8\frac{2*6}{15*6}+7\frac{1*5}{18*5})=-(8\frac{12}{90}+7\frac{5}{90})=-15\frac{17}{90}$