Question

afla numarul necunoscut:a+20=50;a-20=70a+50=100;30+b=60;50-b=30;50+b=80

Answer 1

a=50-20=30
a=70+20=90
a=100-50=50
b=60-30=30
b=50-30=20
b=80-50=30

Answer 2

a+20=50
a=50-20
a=30

a-20=70
a=70+20
a=90

a+50=100
a=100-50
a=50

30+b=60
b=60-30
b=30

50-b=30
b=50-30
b=20

50+b=80
b=80-50
b=30
Sper ca te-am ajutat!