Vì a < b \(\Rightarrow\) 1 - \(\frac{a}{b}\) = \(\frac{b}{b}\) -  \(\frac{a}{b}\)= \(\frac{b-a}{b}\)

Vì a < b \(\Rightarrow\)1 - \(\frac{a+c}{b+c}\)= \(\frac{b+c-a-c}{b+c}\)= \(\frac{b-a}{b+c}\)<     \(\frac{b-a}{b}\)

Vậy a/b < a+c/b+c

P(x)=x^5+3x^3+4x^2+2x-4

Q(x)=x^5-x^4-2^3+3x+4

P(x)+Q(x)=2x^5-x^4+x^3+4x^2+5x

4 máy chứ các bạn

1+11+111+1111+11111=12345