stiind ca a+b=48 calculeaza : a+(b+12)si (a+7)+(b+5)

Răspuns :

a+(b+12)=(a+b)+12=48+12=60

(a+7)+(b+5)=(a+b)+12=48+12=60

a+(b+12)=a+b+12

a+b+12=48+12=60

(a+7)+(b+5)= a+7+b+5=a+b+12=48+12=60