Question

Tính nhanh:

c) 5 . 7 . 77 - 7 . 60 + 49 . 25 - 15 . 42

Answer 1

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

Answer 2

qua kho

Answer 3

TL ; 2870

Answer 4

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

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