(x – 2) – (39 – 45) = | - 5| - | -10|
help me please!!!!!!!!!!!!!!!!!!!!!
K
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Đỗ Thanh Hải
CTVVIP
19 tháng 9 2021
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18 tháng 10 2021
\(5^{x+2}-5^x=3.10^3\)
\(\Rightarrow5^x\left(5^2-1\right)=3000\)
\(\Rightarrow5^x.24=3000\Rightarrow5^x=125=5^3\)
\(\Rightarrow x=3\)
18 tháng 10 2021
\(5^{x+2}-5^x=3\cdot10^3\)
\(\Leftrightarrow5^x\cdot24=3000\)
\(\Leftrightarrow x=3\)
12 tháng 4 2020
a) x + 45 -[ 90 + (-20) + 5 - (-45)] +3x
= x +45 -( 90 - 20 + 5 + 45) + 3x
= x +45 -120 +3x
= -75 +4x
b) x +(-294 +13 -2x) +(94 -13) +9x
= x -281 -2x +81 +9x
= -200 +8x
19 tháng 4 2020
\(2x^2-x-10=0\Leftrightarrow2x^2-5x+4x-10=0\)
\(\Leftrightarrow\left(2x-5\right)\left(x+2\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x=\frac{5}{2}\\x=-2\end{matrix}\right.\)
LT
10 tháng 3 2020
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=> She hates listening to music.
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3. My brother said to me ''Can you lend me some money?''
=> My brother asked me if I could lend him some money.
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=> She told me to wait for her outside her room.
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_Mình không chắc lắm, nếu sai thì nhắc mình nhé!_
KY
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Câu 8. My grandfather used ____________ us to the zoo when he was alive.
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A. clear enough for swimming B. enough clear for swimming
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A. looked B. phoned C. missed D. watched
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(x – 2) – (39 – 45) = | - 5| - | -10|
(x - 2) - 6 = 5 - 10
(x - 2) - 6 = - 5
x - 2 = - 5 + 6
x - 2 = 1
x = 1 + 2
x = 3
Vậy x = 3
\(\left(x-2\right)+6=-5\)
\(\Rightarrow x-2=-11\)
\(\Rightarrow x=-9\)