Răspunsuri

2014-11-10T17:44:06+02:00
I. 230-(x+19)=100
Notam paranteza cu „a”.
230-a=100
a=230-100
a=130
x+19=130
x=130-19
x=111

II. 14+(x-9)=81
Notam paranteza cu „b”.
14+b=81
b=81-14
b=67
x-9=67
x=67+9
x=76

2 4 2