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 )=

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) - ( - ) = - (- ) = + =   =
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) - - (  -1) = - - ( - ) = - - (- ) = - + = - =-
7) -18-(9-5)= -18 -4= -22
8) -0,25-(3-2,25)= -0,25 - 0,75 = - 1
9) - - ( 1 - )= - - ( - ) = - - = - = -