+)|x|+x=1/3

TH1: x>0=>|x|+x=2x=1/3

                      =>x=1/6

TH2: x<0=>|x|+x=-x+x=0x=1/3(loại)

Vậy x=1/6

+)|x-2|=x

TH1: x-2=x

=>x-x=2

0x=2(loại)

TH2: x-2=-x

=>x+x=2

2x=2

x=1

Vậy x=1

356;365;536;563;653;635

356;365;536;563;635;653

\(\frac{A}{11}=\frac{5}{11.16}+\frac{5}{16.21}+\frac{5}{21.26}+\frac{5}{26.31}+\frac{5}{31.36}+\frac{5}{36.41}\)

\(\frac{A}{11}=\frac{16-11}{11.16}+\frac{21-16}{16.21}+\frac{26-21}{21.26}+...+\frac{41-36}{36.41}\)

\(\frac{A}{11}=\frac{1}{11}-\frac{1}{16}+\frac{1}{16}-\frac{1}{21}+\frac{1}{21}-\frac{1}{26}+...+\frac{1}{36}-\frac{1}{41}\)

\(\frac{A}{11}=\frac{1}{11}-\frac{1}{41}=\frac{30}{11.41}\Rightarrow A=\frac{11.30}{11.41}=\frac{30}{41}\)

0x0 & 1x1

dt là 40