Question

[Hoang Diep Anh]

Tinh nham nhung lam sao phai cho nguoi ta hieu duoc cach lam!

a)14×50;16×25

b)2100:50;1400:25

c)132:12;96:8

d)99×101;51×99

Answer 1

[AG_Thanh Phương]

a) 14 x 50 = 7 x 2 x 50 = 7 x 100 = 700 ; 16 x 25 = 4 x 4 x 25 = 4 x 100 = 400

b) 2100 : 50 = 21 x 100 : 50 = 21 x 2 = 42 ; 1400 : 25 = 14 x 100 : 25 = 14 x 4 = 56 

c) 99 x 101 = 99 x ( 100 + 1) = 99 x 100 + 99 x 1 = 9900 + 99 = 9999 ; 51 x 99 = ......

Cái cuối hơi ... khó :))  

Answer 2

[hatsune miku]

a) 14x50= 7x2 x50 = 7 x 100 = 700

    16 x 25 = 4 x4 x25 = 4 x 100 = 400

b) 2100 : 50 = 210 : 5= 42

    1400 : 25 = 5600 : 100 = 56

c) 99 x 101 = 99 x( 100 +1) = 99 x 100 + 1 x 99 =9900+99=9999

  51 x 99 = 51 x 100 - 51 x 1= 5100 - 51 = 5049