1 : 1 + 2 -3 * 125 = ??????
Ai nhanh hất mình tick cho....
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\(A=\left(\frac{1}{125}-\frac{1}{1^3}\right).\left(\frac{1}{125}-\frac{1}{2^3}\right)...\left(\frac{1}{125}-\frac{1}{100^3}\right)\)
\(A=\left(\frac{1}{125}-\frac{1}{1^3}\right).\left(\frac{1}{125}-\frac{1}{2^3}\right)...\left(\frac{1}{125}-\frac{1}{5^3}\right)...\left(\frac{1}{125}-\frac{1}{100^3}\right)\)
\(A=\left(\frac{1}{125}-\frac{1}{1^3}\right).\left(\frac{1}{125}-\frac{1}{2^3}\right)...0...\left(\frac{1}{125}-\frac{1}{100^3}\right)\)
\(\Rightarrow A=0\)
( 1/4- x) ^2 =29/16- 125%
( 1/4- x)^2 = 49/16
( 1/4- x)^ 2 = (7/4)^2
-> 1/4- x = 7/4
x = 1/4- 7/4
x = -3/2
30 giây trước (16:23)
1 + 1 = 2
9 - 6 = 3
15 + 38 = 53
9 : 3 = 3
9 - 125 = -116
(-125) + 65 = 60
95 - (-37) = 95+37=132
\(3x\left(2x+1\right)=0\)
\(\Rightarrow\orbr{\begin{cases}2x+1=0\\3x=0\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}2x=-1\\x=0\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=-\frac{1}{2}\\x=0\end{cases}}\)
\(\frac{\frac{6}{5}+\frac{6}{35}-\frac{6}{125}-\frac{6}{2009}-\frac{6}{2011}}{\frac{7}{5}+\frac{7}{35}-\frac{7}{125}-\frac{7}{2009}-\frac{7}{2011}}\)
\(=\frac{6.(\frac{1}{5}+\frac{1}{35}-\frac{1}{125}-\frac{1}{2009}-\frac{1}{2011})}{7.(\frac{1}{5}+\frac{1}{35}-\frac{1}{125}-\frac{1}{2009}-\frac{1}{2011})}\)
\(=\frac{6}{7}\)
Tìm x
\(a,3x(2x+1)=0\)
\(\Rightarrow\hept{\begin{cases}3x=0\\2x+1=0\end{cases}}\)
\(\Rightarrow\hept{\begin{cases}x=0\\x=\frac{-1}{2}\end{cases}}\)
Vậy \(x=0\)hoặc \(x=\frac{-1}{2}\)
\(b.\frac{2}{3}-\frac{1}{3}(x-\frac{3}{2})-\frac{1}{2}(2x+1)=5\)
\(\frac{2}{3}-\frac{1}{3}x+\frac{1}{2}-x-\frac{1}{2}=5\)
\(\frac{2}{3}+\frac{1}{2}-\frac{1}{2}-x(\frac{1}{3}+1)=5\)
\(\frac{4}{3}x=\frac{2}{3}-5\)
\(\frac{4}{3}x=\frac{-13}{3}\)
\(x=\frac{-13}{3}\div\frac{4}{3}\)
\(x=\frac{-13}{4}\)
Chúc ban học tốt
5.3x=405
3x=405:5
3x=81
3x=34
Vậy x=4
2x:8=4
2x=4.8
2x=32
2x=25
Vậy x=5
x28=x5
x^28-x^5=0
x^5.x^23-x^5.1=0
x^5.(x^23-1)=0
suy ra x^5=0 hoặc x^23-1=0 suy ra x^5=0^5 hoặc x^23=0+1=1 suy ra x=0 hoặc x^23=1^23 suy ra x=0 hoăc x=1
9
(x-2)^4=256
(x-2)^4=4^4
x-2=4
x=4+2=6
(x+1)^3=125
(x+1)^3=5^3
x+1=5
x=5-1=4
a) x. 125 = 100
x = 100 : 125
x = 4/5
b) { [ ( 120 : 60 ) . 5 ] } . 100
= [ 2 . 5 ] . 100
= 10 . 100
= 1000
\(x.125=22+78\)
\(\Leftrightarrow x.125=100\)
\(\Leftrightarrow x=100:125\)
\(\Leftrightarrow x=\frac{4}{5}\)
Câu b sai đề chắc luôn
=-372 tích nha
= - 372 nha