Question

Tính hợp lý: 25.13.4 + 2.17.50

2.24.2 + 3.41.16 + 6.2.8.17

Answer 1

25 . 13 . 4 + 2 . 17 . 50

= 25 . 13 + 2 . 17 . 25 . 2

= 25 . 13 + 

Answer 2

=100.13+100.17=(13+17).100=30.100=3000

b)=2.48+48.41+48.34

=48.(2+41+34)

=48.77

=3696

Answer 3

25 . 13 . 4 + 2 . 17 . 50

= ( 25 . 4 ) . 13 + ( 50 . 2 ) . 17

= 100 . 13 + 100 . 17

= 1300 + 1700

= 3000

Answer 4

2 . 24 . 2 + 3 . 41 . 16 + 6 . 2 . 8 . 17

= ( 24 . 2 ) . 2 + ( 16 . 3 ) . 41 + ( 8 . 6 ) . ( 17 . 2 )

= 48 . 2 + 48 . 41 + 48 . 34

= 48 . ( 2 + 41 + 34 )

= 48 . 77

= 3696

Answer 5

Câu 1:

25.13.4+2.17.50

=25.13.2²+2².17.25

=25.[2²(13+17)]

=25.120

=3000

Câu 2:

2.24.2+3.41.16+6.2.8.17

=2.2³.3+3.41.2⁴+6.2.2³.17

=2⁴.3+2⁴.3.41+2⁴.96

=2⁴.(3+41+96)

=16.140

=2240