Răspuns:
3.
a)8+23+125=156
36+129+1254=1419
135+343+228=706
1250+2220+3459=6929
4.
a)3×3×5=9×5=45
1×4×4=4×4=16
5×2×7=10×7=70
2×3×6=6×6=36