5 x 7 x 77 - 7 x 60 + 49 x 25 -15 x 42

=   5x7x77 -   7x5x12 + 7x7x5x5 - 5x3x7x6

=  35 x77 - 35x12 + 35x35 - 35x18

=  35 x ( 77-12+35-18 )

=  35 x 82 = 2870

2870                        

5 x 7 x 77 - 7 x 60 +49 x 25 -15 x 42.

=5 x 7 x 77 - 7 x 5 x 12 +49 x 5 x 5 - 5 x 3 x 42.

=5 x 539 - 84 x 5 +245 x 5 -5 x 126

=5 x (539 - 84 +245 -126)

=5 x 574 =2870 

2870                         

Trần Tú Anh tính không nhanh.

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

qua kho

TL ; 2870

5x7x77-7x60+49x25-15x42

=5x7x77-7x5x12+7x7x5x5-5x3x7x6

=35x77-35x12+35x35-35x18

= 35x (77-12+35-18)

=35x82

=2870

   5 x 7 x 77 - 7 x 60 + 49 x 25 - 15 x 42 

= 7 x 77 x 5 - 7 x 60 + 7 x 7 x 25 - 15 x 6 x 7

= 7 x 385 - 7 x 60 + 7 x 35 - 7 x 90

= 7 x ( 385 - 60 + 35 - 90 )

= 7 x 270

= 1890

2870 đó bạn

Mk yêu cầu tính nhe bạn

tu tinh đã có kết qủa rồi lai còn 

a) 1 386

b) 7 965 033

c) 153 699 254

d) 1 846 390 458

e) 2 870

a.14×99

b.7989×997

c.15373×9998

d.42×53+47×156×47×114

e.5×77×7-7×60+49×25-15×42

a) 1 386

b) 7 965 033

c) 153 699 254

d) 1 846 390 458

e) 2 870

\(\left(a\right)14.99=1386\)

\(\left(b\right)7989x997=7965033\)

\(\left(c\right)15373.9998=153699254\)

\(\left(d\right)42.53+47.156.47.114=1846390458\)

\(\left(e\right)5.77.7-7.60+49.25-15.42=2870\)