\(164:\left\{192-\left[2^3\cdot15-\left(40-37\right)^2\right]+2021^0\right\}\)
\(=164:\left\{192-120+9+1\right\}\)
\(=164:82=2\)
\(\dfrac{-5}{2}-\left(\dfrac{-7}{2}-\dfrac{7}{4}\right):\left(\dfrac{-7}{3}\right)-\left(\dfrac{-7}{3}\right)-\left(2021\right)^0\)
tính giá trị biểu thức :
\(\left(1+2+3+...+100\right)\cdot\left(1^2+2^2+3^2+...+10^2\right)\cdot\left(65\cdot111\cdot13\cdot15\cdot37\right)\)
Tìm số tự nhiên x, biết:
\(2^{x-1}\) - 1 = 24 - \(\left[3^2-\left(2021^0-1\right)\right]\)
tìm số tự nhiên x biết:
\(2^{x-1}\) -1 = 24 -\(\left[3^2-\left(2021^0-1\right)\right]\)
Tinh nhanh
a) \(\frac{120-\left(-0,5\right).\left(-40\right).\left(-5\right).\left(-0,2\right).20.0,25}{5+10+15+...+1995}\)
b)\(\frac{5.18-10.27+15.36}{10.36-20.54+30.72}\)
c)\(\left(\frac{1}{2}-1\right)\left(\frac{1}{3}-1\right)\left(\frac{1}{4}-1\right)...\left(\frac{1}{1999}-1\right)\)
d)\(-1\frac{1}{2}.\left(-1\frac{1}{3}\right).\left(-1\frac{1}{4}\right)...\left(-1\frac{1}{1999}\right)\)
Tìm số nguyên x biết :
\(\left(7x-11\right)^3=\left(-3\right)^2\cdot15+208\)
Tìm x biết : \(\left(\frac{2}{11\cdot13}+\frac{2}{13\cdot15}+....+\frac{2}{19\cdot21}\right)\cdot462-\left(2,04:\left(x+1,05\right)\right):0,12=19\)
tính
\(A=\left(\dfrac{1}{2}-1\right)\left(\dfrac{1}{3}-1\right).....\left(\dfrac{1}{2021}\right)\)
Tinh nhanh : \(\left(1-\frac{1}{2^2}\right).\left(1-\frac{1}{3^2}\right).\left(1-\frac{1}{4^2}\right)....\left(1-\frac{1}{9801}\right)\)
