Răspuns:
1. a) 7·8-30:10+5=56-3+5=58
b) 4·6-3·5-12:12=24-15-1=8
c) 70-(30-12)+14=70-18+4=56
2. Xn=2n+1
X3=2·3+1=7
X4=2·4+1=9
X5=2·5+1=11
3. a) 1,2·3+2,4·5=3,6+12=15,6
b) 7/2·2/3+4/6=14/6+4/6=18/6=3
c) 10/3-2/3+5/3=7/3+5/3=12/3=4
d) 4,5·3,5+2,7·1,3=15,75+3,51=19,26
Explicație pas cu pas:
