Question

tinh nhanh

5x7x77-7x60+49x25-15x42= ?

Answer 1

5.77.7 - 7.60 + 49.25 - 15.42

= 5 . 7 . 11 . 7 - 7 . 60 + 7.7.25 - 15.6.7

= 7 . ( 35.11 - 60 + 7.25 - 15.6 )

= 7 . ( 385 - 60 + 175 - 90 )

= 7 . 410

= 2870

Answer 2

5 . 7.77 - 7.60 + 7.7.25 - 15.6.7

= 7.(5.77 - 60 + 7.25 - 15.6 )

= 7.(5.77 - 12.5 + 35.5 - 5.18 )

= 7.[5.(77 - 12 + 35 - 18)]

= 7.5.82

= 7.410

= 2870

Answer 3

=2870 nha