\(0,2-\dfrac{3}{4}-\left(-0,02\right)=0,2-0,75+0,02=-0,53\)
\(0,2-\dfrac{3}{4}-\left(-0,02\right)=0,2-0,75+0,02=-0,53\)
Chúc bạn học tốt!!!
Tính
\(\left(\dfrac{-1}{3}\right)^4;\left(-2\dfrac{1}{4}\right)^3;\left(-0,2\right)^2;\left(-5,3\right)^0\)
Thực hiện phép tính hợp lí;
a) \(\left(\dfrac{9}{25}-2,18\right):\left(3\dfrac{4}{5}+0,2\right)\)
b) \(\dfrac{3}{8}.19\dfrac{1}{3}-\dfrac{3}{8}.33\dfrac{1}{3}\)
c) \(1\dfrac{4}{23}+\dfrac{5}{21}-\dfrac{4}{23}+0,5+\dfrac{16}{21}\)
a) \(\dfrac{3}{4}-\dfrac{1}{2}x=-\dfrac{1}{4}\)
b) \(1\dfrac{2}{3}x+0,2=x-\dfrac{7}{8}\)
c) \(\dfrac{3}{4}-\left|x+0.5\right|=\dfrac{1}{5}\)
d) \(\left(x+0.2\right)^2+0,75=1\)
tính hợp lí:
a) \(\left(\dfrac{9}{25}-2,18\right):\left(3\dfrac{4}{5}+0,2\right)\)
CM
\(S=\dfrac{1}{2^2}-\dfrac{1}{2^4}-\dfrac{1}{2^6}-...+\dfrac{1}{2^{4n-2}}-\dfrac{1}{2^{4n}}+...+\dfrac{1}{2^{2002}}-\dfrac{1}{2^{2004}}< 0,2\)
tìm x :
a) \(\dfrac{2x}{3}:\dfrac{1}{5}=1\dfrac{1}{3}:\dfrac{1}{4}\)
b) 1,35 :0,2 = 1,25 : 0,1x
c) \(2:1\dfrac{1}{4}=\dfrac{1}{2}:2x\)
bạn nào biết làm ơn viết cả lời giải cho mình với
Tìm x trong các tỉ lệ thức sau:
a, ( 1/3 . x ) : 2/3 = 7/4 : 2/5
b, 4,5 : 0,3 = 2,25 : ( 0,1 . x )
c, 8 : ( 1/4 . x ) = 2 : 0,02
d, 3 : 9/4 = 3/4 : ( 6 . x )
tính
a)\([\begin{matrix}-2\\3\end{matrix}+0,5\div\left(\dfrac{-3}{2}\right)^2]+[1\dfrac{1}{5}-1,4\times\dfrac{5}{6}+6\)
b)(-0,2)2\(\times\)5 \(-\)\(\dfrac{8^2\times9^5}{3^9\times4^3}\)
1. Tính :
a, \(A=\dfrac{\dfrac{1}{3}-\dfrac{5}{2}}{\dfrac{3}{4}-\dfrac{1}{2}}.\dfrac{\dfrac{5}{6}+\dfrac{7}{3}}{1-\dfrac{5}{6}}.\dfrac{\dfrac{-2}{5}+1}{\dfrac{2}{5}-1}\).
b, \(B=\dfrac{\dfrac{1}{3}-\dfrac{4}{5}}{\dfrac{1}{3}+\dfrac{4}{5}}.\dfrac{\dfrac{3}{4}-\dfrac{5}{3}}{\dfrac{3}{4}+\dfrac{5}{3}}:\dfrac{\dfrac{4}{5}-1}{1-\dfrac{2}{3}}\).
