5×18=5×(10+8)
=5×10+5×8
=50+40
=90,
8×19=8×(10+9)
=8×10+8×9
=80+72
=152,
4×14=4×(10+4)
=4×10+4×4
=40+16
=56,
6×13=6×(10+3)
=6×10+6×3
=60+18
=78,
9×13=9×(10+3)
=9×10+9×3
=90+27
=117,
6×17=6×(10+7)
=6×10+6×7
=60+42
=102,
4×17=4×(10+7)
=4×10+4×7
=40+28
=68,
7×13=7×(10+3)
=7×10+7×3
=70+21
=91,
8×11=8×(10+1)
=8×10+8×10
=80+8
=88,
Sper ca ești mulțumită!
