Question

Tính nhanh:

a) 64 x 25 + 35 x 25 + 25                        b) 58 x 42 + 32 x 8 + 5 x 16

c) ( 42 x 43 + 43 x 57 + 43 ) - 360 : 4       d) ( 372 - 19 x 4 ) + ( 981 : 9 - 13 )

Answer 1

a)64x25+35x25+25=25x(64+35)+25=25x99+25=2475+25=2500

Answer 2

mình trả lời ý a

64 x 25 +35 x 25 +25 x 1

= 25 x ( 64 + 35 + 1 )
= 25 x 100

= 2500

Answer 3

Tính nhanh:

a) 64 x 25 + 35 x 25 + 25 

= 64 x 25 + 35 x 25 + 25 x 1

= 25 x ( 64 + 35 + 1 )

= 25 x 100

= 2500

  b) 58 x 42 + 32 x 8 + 5 x 16

= 

Answer 4

b,58 . 42 + 32 . 8 + 5 . 16

= 58 . 21 .2 + 16 . 2 . 8 + 5 . 16

=58 . 21 .2 + 16.( 8.2 + 5)

=58 . 21 .2 + 16.( 16 + 5 )

= 58 . 21. 2 + 16 . 21

=21. ( 58 . 2 + 16 )

=21 . ( 116 + 16 )

=21 . 132

= 2772

c,( 42 . 43 + 43 . 57 + 43) - 360 : 4

=( 42 . 43 + 43 . 57 + 43 .1) - 360 : 4

=[ ( 42 + 57 + 1 ) . 43] - 360 : 4

=[ 100 . 43] - 360 : 4

= 4300 - 360 : 4

=4300 - 90 

4210