Question

Tính nhanh:  a)  2 x 3 x 4 x 5 x 50 x25                                            b)  25 x 20 x 125 x 8 - 8 x 20 x 5 x 125

Answer 1

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

   = 100  *  100  *  15 = 150000

  

Answer 2

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

   = 100x100x15=150000

 

Answer 3

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

b =     500    *  1000    -   1000     *    100

b =          500000        -           100000

b =                        400000

Answer 4

125*8*25*20-125*8*20*5=1000*500-1000*100=500000-100000

Answer 5

a)2x3x4x5x50x25

=(2x50)x(4x25)x3x5

=100x100x15

=10000x15

=150000