\(\left(1+2+3+4...+100\right).\left(18,34-9,68\right):\left(\frac{1}{2}+\frac{1}{3}+...+\frac{1}{100}\right)\)
=> \(\left(1+2+3+4...+100\right).8,66.\left(1+2+3+...+100\right)\)
=> \(\left(1+2+3+...+1000\right)^2.8,66\)
=>5050\(^2.8,66\)
\(\left(1+2+3+4...+100\right).\left(18,34-9,68\right):\left(\frac{1}{2}+\frac{1}{3}+...+\frac{1}{100}\right)\)
=> \(\left(1+2+3+4...+100\right).8,66.\left(1+2+3+...+100\right)\)
=> \(\left(1+2+3+...+1000\right)^2.8,66\)
=>5050\(^2.8,66\)
Bài 1: a) Tính tổng \(M=3\frac{1}{417}.\frac{1}{762}-\frac{1}{139}.4\frac{761}{762}-\frac{4}{417.762}+\frac{5}{139}\)
b, Tính giá trị của đa thức sai tại x=-1 : \(x^2+x^4+x^6+x^8+....+x^{100}\)
Làm tính nhân
a) ( -5x2 ) ( 3x3 - 2x2 + x - 1 )
b) ( -43 + \(\frac{2}{3}y\) - \(\frac{1}{4}yz\) ) ( \(-\frac{1}{2}xy\) )
\(\frac{4}{9}:\left(\frac{-1}{7}\right)+6\frac{5}{9}.\left(\frac{2}{3}\right)\)
tìm x
a) x+10=25
b)\(\frac{2}{3}\)x-\(\frac{1}{2}\)=\(\frac{1}{10}\)
c)\(\frac{x}{7}\)=\(\frac{-6}{21}\)
d)|\(\frac{2}{3}\)x-\(\frac{1}{2}\)|=\(\frac{5}{6}\)
\(S^2:\)
\(\left(\frac{-1}{5}\right)^{300}\)và \(\left(\frac{-1}{3}\right)^{500}\)
B=1/2:(-1 1/2):1 1/3: (-1 1/4) :1 1/2 :...(-1 1/100
tìm x biet
\(\frac{1}{x}< 2va\frac{1}{x}>-3\)
cho \(\frac{x}{2}=\frac{y}{3}=\frac{z}{4}\)
tinh P=\(\frac{y+z-x}{x-y+z}\)
a. 4/5*(7/2+1/4)^2
b.(x-1/5)^2004+(y+0,4)^100+(z-3)^678=0