Răspuns:
Explicație pas cu pas:
24×35=24(30+5)
=24×30+24×5
=720+120
=840
39x49= 39(40+9)
= 39x40+ 39x9
=1560+351
= 1911
,56×93=56(90+3)
=56×90+56×3
=5040+168
=5208
126×15=126(10+5)
= 126×10+ 126×5
=1260+630
= 1890
,320×24=320(20+4)
=320×20+320×4
=6400+1280
=7680
251×34=251(30+4)
=251×30+251×4
=7530+1004
= 8534
,140×60=140(60+0)
=140×60+140×0
=8400+0
= 8400
,302×28=302(20+8)
=302×20+302×8
=6040+2416
=8456