Giai  

 12,5=12,50    ;        13,4 = 13,40 

Cac so hon kem nhau 0,01 don vi 

So cac so do la :

( 13,40 - 12,50) : 0,01 + 1  = 91 (so )

C

C

Choose the best answer: Knocking on closed doors before entering can be a great way for children to practice _______ behaviors.

A. Respecting

B. Respectful

C. Respective

D. respected

=>45-|-2-x|=20

=>|-2-x|=45-20

=>|-2-x|=25

TH1:-2-x=25

=>x=-2-25

=>x=-27

TH2:-2-x=-25

=>x=-2-(-25)

=>x=23

Vậy x thuộc {-27;23}

I not biết