Question

(1-1/2)²-5/8.(1/3+5-1)= 

conta 

              _

0,75+[1,3:(-1/2-1/3)] =

conta 

 

(-4/5)²:-4.[(1+3/5)+0,7] =

conta 

 

 

Answer 1

(1-1/2)²-5/8.(1/3+5-1)= ((2-1)/2)^2 - 5/8
= (1/2)^2 - 5/8
= 1/4 - 5/8  MMC = 8
= ( 2-5)/8
= - 3/8

0,75+[1,3:(-1/2-1/3)] = 0,75 + [13/10:((-3-2)/6]
= 75/100 + [13/10 : -5/6]
=75/100 + [13/10 . - 6/5]
= 75/100- 78/50
=  75 - 156 
         100
= - 81
   100

(-4/5)²:-4.[(1+3/5)+0,7] 
16/25 ; -4.[8/5 + 7/10]
16/25: -4.[(16+7)/10]
16/25: -4.23/10
16/25 : - 92/10
- 16  .10
   25  92
- 4 .  2
   5  23
-    8
   115