tìm X biết :
125.(x+5)=1000
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a) \(24\times y+76\times y=100\)
\(\Rightarrow\left(24+76\right)\times y=100\)
\(\Rightarrow100\times y=100\)
\(\Rightarrow y=100:100\)
\(\Rightarrow y=1\)
b) \(125\times y-100\times y=1000\)
\(\Rightarrow\left(125-100\right)\times y=1000\)
\(\Rightarrow25\times y=1000\)
\(\Rightarrow y=1000:25\)
\(\Rightarrow y=40\)
\(\frac{2}{3}x\times125=1000\)
\(\frac{2}{3}x\) \(=1000\div125\)
\(\frac{2}{3}x\) \(=8\)
\(x\) \(=8\div\frac{2}{3}\)
\(x\) \(=8\times\frac{3}{2}\)
\(x\) \(=12\)
Bài làm
\(\frac{2}{3}x\times125=1000\)
\(\frac{2}{3}x=\frac{1000}{125}\)
\(\frac{2}{3}x=8\)
\(x=8:\frac{2}{3}\)
\(x=8X\frac{3}{2}\)
\(x=\frac{24}{2}\)
\(x=12\)
Vậy x = 12
`125/5^x=5`
`-> 125/5^x=5/1`
`-> 5*5^x=125`
`->`\(5^{1+x}=125\)
`->`\(5^{1+x}=5^3\)
`->`\(x+1=3\)
`-> x=3-1`
`-> x=2`
Vậy, `5^x=5^2`.
a) 125 x 6 = ...6... × 125
b) 34 × (4 + 5) = 9 × ..34..
c) 18 x 1000=18000
d) 9000 : 100=90
Có : \(\dfrac{x}{5}=\dfrac{125}{x}\)
\(\Leftrightarrow x^2=5.125\)
\(\Leftrightarrow x=\pm25\)
Có : \(\dfrac{x}{5}=\dfrac{125}{x}\)
\(\Leftrightarrow x^2=5.125\)
\(\Leftrightarrow x=\pm25\)
( 5 x − 19 ) + ( 3 x + 24 ) = 125
. 5 x − 19 + 3 x + 24 = 125
8 x + 5 = 125
8 x = 120
x = 15
\(\left(5x-19\right)+\left(3x+24\right)=125\)
.\(5x-19+3x+24=125\)
\(8x+5=125\)
\(8x=120\)
\(x=15\)
125.(x+5)=1000
x+5=1000:125
x +5 = 8
x =8-5
x =3
125×(x+5)=1000
x+5=1000÷125
x+5=8
x=8-5
x=3
Tick cho minh nhe ban!!!!!