Tính nhanh 5 x 7 x 77 – 7 x 60 + 49 x 25 – 15 x 42 14/08/2021 Bởi Aubrey Tính nhanh 5 x 7 x 77 – 7 x 60 + 49 x 25 – 15 x 42
5 x 7 x 77 – 7 x 60 + 49 x 25 – 15 x 42 = 7 x 5 x 77 – 7x 5 x 12 + 7x 7x 5 x 5 – 7x 6 x 5x 3 = 7x 5 x ( 77 – 12 + 7x 5 – 6 x 3 ] = 35 x ( 65 + 35 – 18 ] = 35 x 82 = 2870 Học tốt! Sai nói nha! Bình luận
5 x 7 x 77 – 7 x 60 + 49 x 25 – 15 x 42 =5 . 7 . 77 – 7 . 5 . 12+ 49 . 5 . 5 – 3 . 5 . 42 =5 . 539 – 84 . 5 + 245 . 5 – 5 .126 =5 . (539-84+245-126) =5 . 574 =2870 Bình luận
5 x 7 x 77 – 7 x 60 + 49 x 25 – 15 x 42
= 7 x 5 x 77 – 7x 5 x 12 + 7x 7x 5 x 5 – 7x 6 x 5x 3
= 7x 5 x ( 77 – 12 + 7x 5 – 6 x 3 ]
= 35 x ( 65 + 35 – 18 ]
= 35 x 82
= 2870
Học tốt! Sai nói nha!
5 x 7 x 77 – 7 x 60 + 49 x 25 – 15 x 42
=5 . 7 . 77 – 7 . 5 . 12+ 49 . 5 . 5 – 3 . 5 . 42
=5 . 539 – 84 . 5 + 245 . 5 – 5 .126
=5 . (539-84+245-126)
=5 . 574
=2870