Question

1.(a:4+5):2=24:4

2.a:7+(36:6-21:7)=7

3.(64-3x8-5xa):2=10

4.(6-30::a+5x5):5=5

Answer 1

1.(a:4+5):2=24:4
(a:4+5):2=6
a:4+5=6*2
a:4+5=12
a:4=12-5
a:4=7
a=7*4
a=28

2.a:7+(36:6-21:7)=7
a:7+(6-3)=7
a:7+3=7
a:7=7-3
a;7=4
a=4*7
a=28


3.(64-3*8-5*a):2=10
64-24-5*a=10*2
40-5*a=20
5*a=40-20
5*a=20
a=20:5
a=4



4.(6-30:a+5*5):5=5
6-30:a+25=5*5
6-30:a+25=25
6-30:a=25-25
6-30:a=0
30:a=6
a=30:6
a=5

* insemna ori