Question

Găsește nr potrivit pentru fiecare egalitate
(76- ) :8=9
(39- ) :7=5
(69+) :8=9
(88+) :9=10

Answer 1

(76-a):8=9
(76-a)=9×8
(76-a)=72
a=76-72
a=4

(39-b):7=5
(39-b)=5×7
(39-b)=35
b=39-35
b=4

(69+c):8=9
(69+c)=9×8
(69+c)=72
c=72-69
c=3

(88+d):9=10
(88+d)=10×9
(88+d)=90
d=90-88
d=2