Question

530. вычислите 1) 21-(5-8)= 2) 3,7- (4 - 5,3)= 3)1/6 - ( 5/12 - 7/12) = 4)-13-(20-32)= 5)-4,5-(7-9.5)= 6)-5/8-(5/8-1)= 7)-18-(9-5)= 8)-0,25-(3-2,25)= 9) -2/9 - ( 1 - 8/9 )=

Answer 1

Упражнение 530. Вычислите
1) 21-(5-8)= 21-(-3)=21+3=24
2) 3,7- (4 - 5,3) = 3,7 - (-1,3)=3,7+1,3=5
3) $\frac{1}{6}$ - ( $\frac{5}{12}$ - $\frac{7}{12}$ ) = $\frac{1}{6}$ - (-$\frac{2}{12}$ ) = $\frac{1}{6}$ + $\frac{1}{6}$ = $\frac{2}{6}$  = $\frac{1}{3}$
4) -13-(20-32)= -13-(-12)= -13 +12 =-1
5) -4,5-(7-9,5) = -4,5 - (-2,5) = -4,5+2,5= -2
6) - $\frac{5}{8}$ - ( $\frac{5}{8}$ -1) = - $\frac{5}{8}$ - ( $\frac{5}{8}$ - $\frac{8}{8}$ ) = - $\frac{5}{8}$ - (- $\frac{3}{8}$ ) = - $\frac{5}{8}$ + $\frac{3}{8}$ = - $\frac{2}{8}$ =- $\frac{1}{4}$
7) -18-(9-5)= -18 -4= -22
8) -0,25-(3-2,25)= -0,25 - 0,75 = - 1
9) - $\frac{2}{9}$ - ( 1 - $\frac{8}{9}$ )= - $\frac{2}{9}$ - ( $\frac{9}{9}$ - $\frac{8}{9}$ ) = - $\frac{2}{9}$ - $\frac{1}{9}$ = - $\frac{3}{9}$ = - $\frac{1}{3}$