4 × 125 × 25 × 8

= (4 × 25) × (125 × 8)

= 100 × 1000

= 100 000

2 × 8 × 50 × 25 × 125

= (2 × 50) × (8 × 125) × 25

= 100 × 1000 × 125

= 12 500 000

2 × 3 × 4 × 5 × 50 × 25

= (2 × 50) × (4 × 25) × (3 × 5)

= 100 × 100 × 15

= 150 000

25 × 20 × 125 × 8 - 8 × 20 × 5 × 125

= 8 × 125 × 20 × (25 - 5)

= 1000 × 20 × 20

= 400 000

- (25 x 4) x (125 x8)=100 x 1000 =100000

- (50 x 2) x (8 x 125) x 25=100 x 1000 x 25 =2500000

- (2 x 50 ) x (4 x 25) x (3 x5)=100 x 100 x 15=150000

- 25 x 20 x125 x 8 - 5

= (20 x 5) x (125 x 8) -25=100 x 1000 -5 =100000 - 5 =99995

4 *125*25*8

=4*25*125*8

=100*1000

=100000

2*8*50*25*125

=2*50*8*125*25

=100*1000*25

=2500000

2*3*4*5*50*25

=2*50*4*25*3*5

=100*100*15

=150000

25*20*125*8-8*20*5*125

=25*4*5*125*8-8*125*20*5

=100*1000*5-1000*100

=500000-100000

=400000

=

2 x 8 x 50 x 25 x 125       

= ( 125 x 8 ) x ( 50 x 2 ) x 25

= 1000 x 100 x 25

=2500000

4 x 125 x 25 x  8 

= ( 125 x 8 ) x ( 25 x 4 )

= 1000 x 100

=100000

2 x 3 x 4 x 5 x 50 x 25    

= ( 25 x 4 ) x ( 2 x 50 ) x ( 3 x 5 )

= 100 x 100 x 15

= 150000

  25 x 20 x 125 x 8 -  8 x 20 x 5 x 125

= ( 25 x 20 ) x ( 125 x 8 ) - ( 20 x 5 ) x ( 125 x 8 )

= 500 x 1000 - 100 x 1000

= 500000 - 100000

= 400000

4 x 125 x 25 x 8

= (4x25) x (125x8)

=100x1000

=100000

4 x 125 x 25 x 8

= ( 4 x 25 ) x ( 125 x 8 )

= 100         x 1000

=     100000

   2 x 8 x 50 x 25 x 125

=  ( 2 x 50 ) x ( 8 x 125 ) x 25

=    100       x 1000        x 25

=     100000                  x 25

=              2500000

    2 x 3 x 4 x 5 x 50 x 25

=  ( 2 x 50 ) x ( 4 x 25 ) x 3 x 5

=   100        x    100     x 3 x 5 

=        10000               x 15

=       150000

  25 x 20 x 125 x 8 - 8 x 20 x 5 x 125

= ( 8 x 125 ) x 25 x 20 - ( 8 x 125 ) x ( 20 x 5 )

=  1000        x 50        - 1000         x 100

=       50000                - 100000

=           - 50000

Chúc bạn hok tốt !

a, 25*5*13*4=6500

87*125*8*4=348000

b,50*76*2=7600

19*4*25*8=15200

c,303*20*6*5=181800

4*889*25=88900

a)6500,348000.

b)7600,15200.

c)181800,88900.

a,= ( 25x4 ) x ( 13x5 )

   = 100 x 65

    = 6500

     = ( 125x8 ) x ( 87x4 )

      = 1000 x 348

       = 348000

b,    = ( 50x2 ) x 76

        = 100 x 76

        = 7600

         = ( 4x25 ) x ( 19x8 )

          =100 x 152

           = 15200

          c, = ( 20x5 ) x ( 303x6 )

               = 100 x 1818

                = 181800

               = ( 4x25 ) x 889

               = 100 x 889

                = 88900

1 : Tính nhanh:

a) 2376 + 3425 - 376 - 425 = ( 2376 - 376 ) + ( 3425 - 425 )

                                       = 2000 + 3000

                                       = 5000

b)4638 - 2437 + 5362 - 7563 = 2210 + ( - 2210 )

                                          = 0

c) 45 + 45 + 45 + 45 + 15 + 15 + 15 + 15

  = 45 x 4 + 15 x 4

 = ( 45 + 15 ) x 4

 = 60 x 4

 = 240

d) 4 x 125 x 25 x 8 = ( 4 x 25 ) x ( 125 x 8 )

                            = 100 x 1000

                            = 100000

e) 2 x 8 x 50 x 25 x 125 = ( 2 x 50 ) x ( 8 x 125 ) x 25

                                   = 100 x 1000 x 25

                                   = 100000 x 25

                                   = 2500000

2 : Tính nhanh bằng 2 cách:

C1 : 125 + 125 + 125 + 125 - 25 - 25 - 25 - 25

    = ( 125 - 25 ) + ( 125 - 25) + ( 125 - 25 ) + ( 125 - 25 )

    =100 + 100 + 100 + 100 

    = 100 x 4 

    = 400

C2 : 125 + 125 + 125 + 125 - 25 - 25 - 25 - 25

     = 125 x 4 - 25 x 4

     = ( 125 - 25 ) x 4

     = 100 x 4

     = 400

1.

a. 5000
b. 0

c. 240

d. 100000

e. 2500000

2.

400

1: Tính nhanh:

a, 2376 + 3425 - 376 - 425

 = ( 2376 - 376 ) + ( 3425 - 425 )

 = 2000 + 3000

 = 5000.

b, 4638 - 2437 + 5362 - 7563

 = 2210 + (-2210)

 = 0.

c, 45 + 45 + 45 + 45 + 15 + 15 + 15 + 15 + 15

 = ( 45 + 15 ) +  ( 45 + 15 ) +  ( 45 + 15 ) +  ( 45 + 15 ) 

 = 60 + 60 + 60 + 60

 = 240.

d, 4 x 125 x 25 x 8 

 = ( 4 x 25 ) x ( 125 x 8 )

 = 100 x 1000

 = 100000.

e, 2 x 8 x 50 x 25 x 125

 = ( 2 x 50 ) x ( 8 x 125 ) x 25

 = 100 x 1000 x 25

 = 2500000.

2: Tính nhanh bằng hai cách:

  125 + 125 + 125 + 125 - 25 - 25 - 25- 25

= ( 125 - 25 ) + ( 125 - 25 ) + ( 125 - 25 ) + ( 125 -25 )

= 100 + 100 + 100 + 100

= 400.

=500000-100000

=400000

b) 25 x 20 x 125 x 8 - 8 x 20 x 5 x 125

= 25 x 20 x 25 x 5 x 8 - 8 x 20 x 5 x 5 x 25

= 25 x 20 x 25 x 40 - 8 x 10 x 25 x 25

= 500 x 1000 - 80 x 625

= 500 000 - 50000

= 450000

 25 x 20 x 125 x 8 - 8 x 20 x 5 x 125

= 25 x 20 x 25 x 5 x 8 - 8 x 20 x 5 x 5 x 25

= 25 x 20 x 25 x 40 - 8 x 20 x 25 x 25

= 500 x 1000 - 160 x 625

= 500 000 - 100000

= 400000

a, 4¹⁰. 2³⁰=2²⁰.2³⁰=2⁵⁰

b,9²⁵.27⁴.81³= 3⁵⁰.3¹².3¹²=3⁷⁴

Tương tự các câu khác....

a, 4¹⁰.2³⁰ = (2²)¹⁰.2³⁰ = 2²⁰.2³⁰ = 2⁵⁰
b, 9²⁵.27⁴.81³ = (3²)²⁵.(3³)⁴.(3⁴)³ = 3⁵⁰.3¹².3¹² = 3⁷⁴
c, 25⁵⁰.125⁵ = (5²)⁵⁰.(5³)⁵ = 5¹⁰⁰.5¹⁵ = 5¹¹⁵
d, 64³.4⁸.16⁴ = (2⁶)³.(2²)⁸.(2⁴)⁴ = 2¹⁸.2¹⁶.2¹⁶ = 2⁵⁰
e, 3⁸ : 3⁶ = 3²
2¹⁰ : 8³ = 2¹⁰ : (2³)³ = 2¹⁰ : 2⁹ = 2
12⁷ : 6⁷ = (12 : 6)⁷ = 2⁷
@Dương Tuyết Mai

a)=(2*50)*(4*25)*(3*5)

   = 100  *  100  *  15 = 150000

a)=(2x50)x(4x25)x(3x5)

   = 100x100x15=150000

b = ( 25 * 20 ) * (125 * 8 ) - ( 8 * 125 ) * ( 20 * 5 )

b =     500    *  1000    -   1000     *    100

b =          500000        -           100000

b =                        400000

`5 xx 74 xx 2  = 5xx 2 xx 74 = 10xx74 = 740`

`4xx196xx5 = 4xx5xx196 = 20xx196 = 3920`

`(50 + 25)xx4 = 50xx4 + 25xx4 = 200 + 100 = 300`

`125xx(80+8) = 125xx80 + 125xx8 = 10000 + 1000 = 11000`