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a+b=150, a÷b=2 rest9=>a=b+2×9

Răspuns :

a+b=150
a:b=2 rest 9
a=2b+9
2b+9+b=150
3b+9=150
3b=150-9
3b=141
b=141:3
b=47

a+b=150
a+47=150
a=150-47
a=103
a+b= 150
150:2 = 75
75+75= 150

a:b=2 rest 9
2 rest9× 2
1.45 +1.45 = 2.9