Question

Tinh nhanh:.1650:(5.79(125+5.49)+5.21)

Answer 1

1650 : [ 5 . 79 . ( 125 + 5 . 49 ) + 5 . 21 ]

= 1650 : [ 5 . ( 79 + 21 ) . ( 125 + 245 ) ]

= 1650 : [ 5 . 100 . 370 ]

= 1650 : [ 500 . 370 ]

= 1650 : 185000

= \(\dfrac{1650}{185000}\)

= \(\dfrac{33}{3700}\)

Answer 2

Dấu . là nhân hay phẩy vậy bạn ?

Answer 3

1650:(5.79.(125+5.49)+5.21)

=1650:[5.(79+21).(125+245)

=1650:[5.100.370]

=1650:185000

=33/3700