Question

Calculeaza.a..36-9×a=9 b.d:5+15=25 c..16+b×4=32 d..n×5-5=40 e..81-c÷9=72

Answer 1

36-9×a=9
9×a=36-9
9×a=27
a=27:9
a=3
Verificare:
36-9×3=9

d:5+15=25
d:5=25-15
d:5=10
d=10×5
d=50
Verificare:
50:5+15=25

16+b×4=32
b×4=32-16
b×4=16
b=16:4
b=4
Verificare:
16+4×4=32

n×5-5=40
n×5=40+5
n×5=45
n=45:5
n=9
Verificare:
9×5-5=40

81-c:9=72
c:9=81-72
c:9=9
c=9×9
c=81
Verificare:
81-81:9=81-9=72