Question

Resolva as expressões numericas:


(20+21÷7).(36÷9-1)

[(72÷8+6)÷15+4]÷5

3.[(42-8.5)+(38-7.5)]

Answer 1

(20+21÷7).(36÷9-1)
(20+3).(4-1)
(23).(3)
69
____________________
[(72÷8+6)÷15+4]÷5
[(9+6)÷15+4]÷5
[15÷15+4]÷5
[1+4]÷5
5 ÷5
1
_____________________
3.[(42-8.5)+(38-7.5)]3.[(42-40)+(38 - 35)]3.[2+3]
3. 5
15

Answer 2

(20+21÷7).(36÷9-1) =  (20+3).(4-1) ==> 23.3 ==> 69
===================================================
[(72÷8+6)÷15+4]÷5 = [(9+6)÷15+4]÷5 ==> [(15)÷15+4]÷5

 [1+4]÷5 ==> 5 : 5 ==> 1
======================================================
3.[(42-8.5)+(38-7.5)] ==> 3.[(42-40)+(38-35)] ==> 3.[ 2+3] ==> 3.5 ==> 15