Question

Completeaza numarul necunoscut. 90-♡=80-30 ♡-40=50-30 80-20=70-♡ 90-70=♡-30

Answer 1

90-40=80-30
60-40=50-30
80-20=70-10
90-70=50-30

Answer 2

90-x=80-30
90-x=50
x=90-50
x=40


x-40=50-30
x-40=20
x=20+40
x=60

80-20=70-x
60=70-x
x=80-70
x=10

90-70=x-30
20=x-30
x=30+20
x=50

x- este inimioara