Răspuns:
7
a)
ax30=1500
a=1500:30
a=50
80xb=2400
b=2400:80
b=30
2500:a=50
a=2500:50
a=50
b:400=70
b=70x400
b=28 000
c:80=400
c=400x80
c=32 000
27 000:c=9
c=27 000:9
c=3000
8)
nx80=5600
n=5600:80
n=70
n:70=600
n=600x70
n=42 000
ax9=63
a=63:9
a=7
5400:x=60
x=5400:60
x=90