Gọi k,k+1,k+2 lần lượt là 3 số tự nhiên liên tiếp

Ta có:

k+(k+1)+(k+2) 

=3k+3

Vì 3k chia hết cho 3

=> tron 3 số nguyên liên tiếp luôn có 1 só chia hết cho3

tíc mình  nha

10 x 10 + 10 x 10 = 200

\(A=\left\{x\in N\left|x< 10\right|\right\}\)

\(B=\left\{2,4,6,8,10,...\right\}\)

\(A\subset N;B\subset N;N^{\cdot}\subset N\)

\(\frac{333}{444}=\frac{333:111}{444:111}=\frac{3}{4}\)

 1.she is a student and he is a student , too

  2.they are doctors

Are they doctors?

  3.we go to school everyday

Do you go to shool everyday?

  4.he gets to school at 6 o'clock

Does he get up at 6 o'clock?  

  5.she gets to chool at 6 am

Does she get to school at 6 a.m ?

  6.my mother goes to work everyday

Does your mother go to work everyday?

( x - 3) - ( 10 - 5x ) = 0

x - 3 = 10 - 5x

-10 - 3 = -5x - x

-13 = -6x

=> x = 13/6

x - 99 = 1

 x = 1 + 99

  x = 100

Ủng hộ tíck mik nha mọi người !!! Please~~~~

what is this? : Cái gì đây

Ủng hộ tíck nha !!!

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