A=1/2+1/3+1/4+...+1/2019;B=1/2018 +2/2017+3/2016+...+2017/2+2018/1.Tính A/B
Tìm x,y thoả mãn
/x-2017/+/y-2018/ <=0
/3.x-y/^5+10./y+2/3/^7 <=0
c,1/2.(3/4.x-1/2)^2018+2017/2019./4/5.y+6/25/<=0
d,2017./2x-y/^2018+2018./y-4/^2017<=0
giúp em vs m.n ưi,mai em nộp ùi
Tính P = \(\frac{\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+....+\frac{1}{2019}}{\frac{2018}{1}+\frac{2017}{2}+\frac{2016}{3}+....\frac{1}{2018}}\)
x+1/2020 + x+2/2019 + x+3/2018 + x+4/2017
cho đa thức f(x)=ax^2+bx+c .Biết f(0)=2017 ;f(1)=2018 ;f(-1)=2019 .Tính f(2)
/2017-x/+/2018-x/+/2019-x/=2
tìm x /2017-x/+/2018-x/+/2019-x/=2
so sánh a,b biết: a= 2^2018-3/2^2017-1 và b=2^2017-3/2^2016-1
1,tìm x biết:\(\left|2017-x\right|+\left|2018-x\right|+\left|2019-x\right|=2\)