\(A=\left(2-\dfrac{3}{2}\right)\left(2-\dfrac{4}{3}\right)\left(2-\dfrac{5}{4}\right)\left(2-\dfrac{6}{5}\right)\)
\(=\dfrac{1}{2}.\dfrac{2}{3}.\dfrac{3}{4}.\dfrac{4}{5}\)
\(=\dfrac{1}{5}\)
Tính :
\(\left(-0,5-\frac{3}{5}\right):\left(-\frac{22}{25}\right)+\left(\frac{2}{25}-1,08\right)\times\frac{3}{8}-72:12^2\)
thực hiện phép tính
a.\(\frac{5}{7}.1^9_{13}-\frac{5}{7}.\frac{9}{13}\)
b.\(\frac{11}{24}-\frac{5}{41}+\frac{13}{24}+0,5-\frac{36}{41}\)
c.\(\frac{-4}{13}.\frac{5}{17}+\frac{-12}{13}.\frac{4}{17}+\frac{4}{13}\)
d.\(\left(\frac{4}{3}-\frac{3}{2}\right)^2-2.\left|\frac{-1}{9}\right|+\left(\frac{-5}{18}\right)\)
e.\(\left(\frac{-3}{4}+\frac{2}{3}\right):\frac{5}{11}+\left(\frac{-1}{4}+\frac{1}{3}\right):\frac{5}{11}\)
Tính
a) \(\frac{3}{5}+\frac{1}{10}_{ }-\frac{6}{5}\)
b)\(1\frac{3}{4}.\frac{2}{7}+1\frac{3}{4}.\frac{5}{7}\)
c)\(\left(\frac{3}{4}\right)^2.\sqrt{16}+\left[\left(-2\right)^3;\left(-8\right)-1^{2019}\right]\)
Tìm x biết :
a) \(\frac{-5}{7}\)-\((\frac{1}{2}-x)\)=\(\frac{-11}{4}\)
b)\((2x-1)^2-5=20\)
c)\(\left(\frac{3}{4}x+3\right)-\left(\frac{2}{3}x-4\right)-\left(\frac{1}{6}x+1\right)=\left(\frac{1}{3}x+4\right)-\left(\frac{1}{3}x-3\right)\)
d)\(\frac{x-6}{4}=\frac{4}{x-6}\)
e)\(\frac{2x-1}{3}=\frac{-27}{1-2x}\)
f)\(\left(x-1\right)^{x+2}=\left(x-1\right)^2\)
Tìm x biết :
a) \(\frac{-5}{7}\)-\((\frac{1}{2}-x)\)=\(\frac{-11}{4}\)
b)\((2x-1)^2-5=20\)
c)\(\left(\frac{3}{4}x+3\right)-\left(\frac{2}{3}x-4\right)-\left(\frac{1}{6}x+1\right)=\left(\frac{1}{3}x+4\right)-\left(\frac{1}{3}x-3\right)\)
d)\(\frac{x-6}{4}=\frac{4}{x-6}\)
e)\(\frac{2x-1}{3}=\frac{-27}{1-2x}\)
f)\(\left(x-1\right)^{x+2}=\left(x-1\right)^2\)
a)tìm x,y biết:\(\frac{x}{12}=\frac{y}{3}vàx-y=36\)
b)tìm x biết:\(\frac{2}{3}+\frac{5}{3}x=\frac{5}{7}\)
\(\frac{11}{12}-\left(\frac{2}{5}+x\right)=\frac{2}{3}\)
\(\left|x-\frac{2}{5}\right|+\frac{3}{4}=\frac{11}{4}\)
\(\left(x-\frac{1}{2}\right)^3=\frac{1}{27}\)
Tính hợp lí (nếu có thể):
\(\left(\frac{1}{2^2}-1\right).\left(\frac{1}{3^2}-1\right).\left(\frac{1}{4^2}-1\right)...\left(\frac{1}{100^2}-1\right)\)
Mng ơi giúp em với ạ :(((
tìm x,y,z biết
a.\(\left(\frac{1}{3}.x\right):\frac{2}{3}=4^3_8\)
b.\(1^2_3x-\frac{1}{4}=\frac{5}{6}\)
c.\(\left|x-\frac{2}{5}\right|+\frac{3}{4}=\frac{11}{4}\)
d.x:y:z=2:3:4 và x+y-2z=3
e.\(\frac{x}{4}=\frac{y}{3}=\frac{z}{9}vàx-3y+4z=62\)
a,\(\left(2x-1\right)=-8\)
b,\(\left(3x-2\right)^2=\frac{1}{49}\)
c,\(x^3-\frac{1}{4}.x=0\)
d,\(\frac{x^2}{6}=\frac{24}{25}\)
e,\(1,5.\left(\frac{3}{2}-x\right)^3=-\frac{3}{16}\)
