Explicație pas cu pas:
a=15×3+2...a=47
b=9×7+5...b=68
c=60÷12...c=5
d=95÷5...d=19
e=3×21+4....e=67
f-2=4×13...f=4×13+2.....f=54
(49+63)÷7=112÷7=16 sau =49÷7+63÷7=7+9=16
(63-36)÷3=27÷3=9 sau =63÷3-36÷3=21-12=9
96÷12-72÷12=8-6=2 sau =(96-72)÷12=24÷12=2
98÷14-70÷14=7-5=2 sau =(98-70)÷14=28÷14=2
