1+5=? giúp :))))))))))))))
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\(\frac{4}{9}:\frac{5}{7}=\frac{4}{9}\times\frac{7}{5}=\frac{4\times7}{9\times5}=\frac{28}{45}\)
\(\frac{5}{7}:\frac{4}{9}=\frac{5}{7}\times\frac{9}{4}=\frac{5\times9}{7\times4}=\frac{45}{28}\)
\(\frac{1}{3}:\frac{1}{4}=\frac{1}{3}\times4=\frac{4}{3}\)
\(\frac{1}{4}:\frac{1}{3}=\frac{1}{4}\times3=\frac{3}{4}\)
Ta có: \(\dfrac{1}{5}-\left|\dfrac{1}{5}-x\right|=\dfrac{1}{5}\)
\(\Leftrightarrow\left|\dfrac{1}{5}-x\right|=0\)
\(\Leftrightarrow x-\dfrac{1}{5}=0\)
hay \(x=\dfrac{1}{5}\)
a: \(=\left(1+\dfrac{\sqrt{5}\left(\sqrt{5}-1\right)}{-\left(\sqrt{5}-1\right)}\right)\left(\sqrt{5}+1\right)\)
=(1-căn 5)(1+căn 5)
=1-5=-4
b: \(=\sqrt{3}+\sqrt{2}+\sqrt{3}-\sqrt{2}=2\sqrt{3}\)
\(C=\frac{1}{5}+\frac{1}{5^2}+\frac{1}{5^3}+....+\frac{1}{5^{300}}\)
\(5C=1+\frac{1}{5}+\frac{1}{5^2}+...+\frac{1}{5^{299}}\)
\(5C-C=1-\frac{1}{5^{300}}\)
\(4C=1-\frac{1}{5^{300}}\)
\(C=\frac{1-\frac{1}{5^{300}}}{4}\)
20 - [ 30 - ( 5 - 1 ) * ( 5 - 1 ) ] = 20 - [ 30 - 4 * 4 ]
= 20 - [ 30 - 16 )
= 20 - 14
= 6
20 - [ 30 - ( 5 - 1 ) × ( 5 - 1 ) ]
= 20 - [ 30 - 4 × 4 ]
= 20 - [ 30 - 16 ]
= 20 - 14
= 6
3/7 + x = 6/5
x = 6/5 - 3/7
x = 27/35
( ai tích mik mik tích lại cho )
Đặt `B=1/5+1/5^{2}+1/5^{3}+...+1/5^{101}`
`<=>5B=1+1/5+1/5^{2}+...+1/5^{100}`
`<=>5B-B=(1+1/5+1/5^{2}+...+1/5^{100})-(1/5+1/5^{2}+...+1/5^{101})`
`<=>5B-B=1+1/5+1/5^{2}+...+1/5^{100}-1/5-1/5^{2}-...-1/5^{101}`
`<=>4B=1-1/5^{101}`
`<=>B=(1-1/5^{101})/4`
`@Shả`
\(A=\dfrac{1}{5}+\dfrac{1}{5^2}+...+\dfrac{1}{5^{101}}\)
\(5A=1+\dfrac{1}{5}+...+\dfrac{1}{5^{100}}\)
\(5A-A=1+\dfrac{1}{5}+...+\dfrac{1}{5^{100}}-\dfrac{1}{5}-\dfrac{1}{5^2}-...-\dfrac{1}{5^{101}}=1-\dfrac{1}{5^{101}}\Rightarrow A=\dfrac{1-\dfrac{1}{5^{101}}}{4}\)
bằng 6
TL:
1+5=6
~HT~