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rezolva umatoa`rele cerinte: a)afla nr a,daca ab+ac=51 si b+c=52; b)afla nr a daca ab-a=45 si b-c=9; c)afla suma b+c daca ab+70=170 si a=25 d)afla diferent b-c,daca ab-ac-48=2 si a=10

Răspuns :

MaestraCifrelor
Vom da factor comun:
a)ab+ac=520
a (b+c)=520
a×52=520
a=520÷52
a=10

b)ab-ac=45
a (b-c)=45
a×9=45
a=45÷9
a=5

c)ab+ac+70=170
ab+ac=170-70=100
a (b+c)=100
25×(b+c)=100
b+c=100÷25
b+c=4

d)ab-ac-48=2
ab-ac=48+2=50
a (b-c)=50
10×(b-c)=50
b-c=50÷10
b-c=5