Question

tính 

41 x 36 + 59 x 90 + 41 x 84 + 59 x 30

4 x 51 x 7 + 2 x 86 x 7 + 12 x 2 x 7

 

Answer 1

41 x 36 + 59 x 90 + 41 x 84 + 59 x 30

= 41 x (36 + 84) + 59 x ( 90 + 30 )

= 41 x 120 + 59 x 120

= 120 x ( 41 + 59 )

= 120 x 100

= 12000

4 x 51 x 7 + 2 x 86 x 7 + 12 x 2 x 7

= 7 x ( 51 x 4 + 86 x 2 + 12 x 2 )

= 7 x ( 204 + 172 + 24 )

= 7 x 400

=2800

Answer 2

41x 36 +59 x 90 +41 x84 +59 x 30

  =41x (36+84) +59 x (90+30)

  =41 x 120 + 59x 120

  =120 x (41+59)

  =120x 100

  =12000

4x 51 x 7 + 2 x 86 x 7 + 12 x 2 x 7

  =7x (51 x 4 + 86 x 2 - 12 x 2 )

  =7x ( 204+ 172 + 24 )

  = 7x 400

 =2800

Answer 3

Ta có:

41 x 36 + 59 x 90 + 41 x 84 + 59 x 30

= 41 x (36+84) + 59 x (30+90)

=41 x 120+59 x 120

=(41+59) x 120=100 x 120=12000

4 x 51 x 7 + 2 x 86 x 7 + 12 x 2 x 7

=2 x 7 x (51 x 2+86+12)

=14 x 200

=2800

Answer 4

3/5 x X =4/7

         X=4/7:3/5

          X=20/21

X : 8/6 = 9/5

X          =9/5x8/6