Đáp án: Ta có: 43 . 7 + 29 . 57 + 13 . 43 +57 =43 . 7 + 13 . 43 + 29 . 57 +57 = 43.(7+13) + 57.(29+1) =43 . 20 + 57 . 30 =860 + 1710 =2570 Reply
43 . 17 + 29 . 57 + 13 . 43 +57 =43 . 7 + 29 . 57 + 13 . 43 + 57 . 1 =43 . ( 7 + 13 ) +57 . ( 29 + 1 ) =43 . 20 + 57 . 30 =860 + 1710 =2570 Reply
Đáp án:
Ta có: 43 . 7 + 29 . 57 + 13 . 43 +57
=43 . 7 + 13 . 43 + 29 . 57 +57
= 43.(7+13) + 57.(29+1)
=43 . 20 + 57 . 30
=860 + 1710
=2570
43 . 17 + 29 . 57 + 13 . 43 +57
=43 . 7 + 29 . 57 + 13 . 43 + 57 . 1
=43 . ( 7 + 13 ) +57 . ( 29 + 1 )
=43 . 20 + 57 . 30
=860 + 1710
=2570