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

=8700000

87 x 25 x 4 x 10 x 20 x 5=8 700 000

870000

A = 2 x 53 x 12 + 4 x 6 x 87 - 3 x 8 x 40

= 24 x 53 + 24 x 87 - 24 x 40

= 24 x ( 53 + 87 - 40 )

= 24 x 100

= 2400

B = 5 x 7 x 77 - 7 x 60 + 49 x 25 - 15 x 42

= 5 x 7 x 77 - 7 x 5 x 12 + 49 x 5 x 5 - 5 x 3 x 42

= 5 x 539 - 84 x 5 + 245 x 5 - 5 x 126

= 5 x ( 539 - 84 + 245 - 126 )

= 5 x 574

= 2870

a=2×53×12+4×6×87-3×8×40

a=24×53+24×87-24×40

a=24×(53+87-40)

a=24×100

a=2400

nếu các bạn trả lời phép tính của mình thì mong các vạn ghi tất cả các bước làm và phép tính ra ạ ><

`25/7 - 2 +3/2`

`= 25/7 - 14/7 +3/2`

`= 11/7 +3/2`

`= 22/14 + 21/14`

`= 43/14`

__

`4/5 xx 10/3 : 8`

`= 4/5 xx 10/3 xx 1/8`

`= 40/15 xx 1/8`

`= 8/3 xx 1/8`

`= 8/24`

`=1/3`

__

`7/3 + 2/5 :1/6`

`= 7/3 +2/5 xx 6`

`= 7/3 + 12/5`

`= 35/15 + 36/15`

`= 71/15`

`25/7 - 2 + 3/2= (25/7+ 3/2) - 2 = 71/14  - 2 = 43/14 `

`4/5 xx 10/3 : 8=(4/5 xx 10/3) xx 1/8  = 8/3 xx 1/8  = 1/3 `

`7/3 + 2/5 : 1/6 = 7/3 + 2/5 xx 6/1 = 7/3 +( 2/5 xx 6/1 ) = 7/3 +12/5 = 71/15`

a. 4.37.25.50.12

  =(4.25).(50.12).37

  =100.600.37

  =2220000

\(a.\left(4.50\right).\left(25.12\right).37\)

\(=200.300.37=2220000\)

\(b.\left(46+54\right)+\left(17+83\right)\)

\(=100+100=200\)

\(c.87.\left(36+69\right)=87.105=9135\)

\(d.\left(135+65\right)+\left(360+40\right)\)

\(=200+400=600\)

\(e.\left(463+137\right)+\left(318+22\right)\)

\(=600+340=940\)

a,4x37x25x50x12=(50.4).(25.12).37=200.300.37=2220000

b,46+17+54+83=(46+54)+(17+83)=100+100=200

c,87.36+87.69=87.(36+69)=87.105=9135

d,135+65+360+40=(135+65)+(360+40)=200+400=600

e,463+318+137+22=(463+137)+(318+22)=600+340=940

\(a)9.4.25.8.125\)

\(=9.\left(4.25\right).\left(8.125\right)\)

\(=9.100.1000\)

\(=900.1000\)

\(=900000\)

\(a,9.4.25.8.125=9.\left(4.25\right).\left(8.125\right)=9.100.1000=900000\)

\(b,25.5.27.2\)(câu này hình như thiếu đề, ko tính nhanh đc)

\(c,37.7+80.3+43.7\)\(=7.\left(37+43\right)+80.3\)\(=7.80+3.80=80\left(7+3\right)=80.10=800\)

\(d,113.38+113.62+87.62+87.38\)\(=113\left(38+62\right)+87\left(62+38\right)\)

\(=113.100+87.100=100.\left(113+87\right)=100.200=20000\)

Viết gọn lũy thừa:

\(a,x.x.y.y.x.y.x=\left(x.x.x.x\right).\left(y.y.y\right)=x^4.y^4\)

\(b,7^5:343=7^5:7^3=7^{5-3}=7^2\)

\(c,A^{12}:A^{18}=A^{12-18}=A^{-6}\)

\(d,x^7.x^4.x=x^{7+4+1}=x^{12}\)

A = 4 . 2 . 25 . 5 . 175 

A = 2² . 2 . 5² . 5 . 5² . 7 

A = 2²⁺¹ . 5²⁺¹⁺² . 7  

A = 2³ . 5⁵ .7

A = 175000

\(B=4^2-10^4:\left(50\cdot273-50\cdot73\right)\)

\(B=4^2-10^4:\left[50\cdot\left(273-73\right)\right]\)

\(B=4^2-10^4:\left(50\cdot200\right)\)

\(B=4^2-10^4:10^4=4^2-1=15\)

\(C=3\times53\times6+2\times9\times87-18\times40\)

\(C=18\times53+18\times87-18\times40\)

\(C=18\times\left(53+87-40\right)\)

\(C=18\times100=1800\)