c) 5 . 7 . 77 - 7 . 60 + 49 . 25 - 15 . 42
=5.7.77-7.5.12+7.7.5.5-3.5.7.6
=5.7.(77-12+5.7-3.6)
=35.82=2870
Đúng 0
Bình luận (0)
5 x 7 x 77 - 7 x 60 + 49 x 25 - 15 x 42
= 5 x 7 x ( 7 x 11 ) - 7 x ( 5 x 2 x 6 ) + ( 7 x 7 ) x ( 5 x 5 ) - 15 x ( 6 x 7 )
= 5 x 7 x 7 x 11 - 7 x 5 x 2 x 6 + 7 x 7 x 5 x 5 - 15 x 6 x 7
= 5 x 7 x 7 x 11 - 7 x 5 x 2 x 6 + 7 x 7 x 5 x 5 - 15 x 6 x 7
= 0 x 11 - 2 + 0 - 15
= 0 - 2 + 0 - 15
= -8 + 0 - 15
= -8 15
= -23
#munpkutkuy
#Study well :3
