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a) \(8x+56:14=60\)
\(\Rightarrow8x+4=60\)
\(\Rightarrow8x=56\)
\(\Rightarrow x=\dfrac{56}{8}\)
\(\Rightarrow x=7\)
b) Mình làm rồi nhé !
c) \(41-2^{x+1}=9\)
\(\Rightarrow2^{x+1}=41-9\)
\(\Rightarrow2^{x+1}=32\)
\(\Rightarrow2^{x+1}=2^5\)
\(\Rightarrow x+1=5\)
\(\Rightarrow x=4\)
d) \(3^{2x-4}-x^0=8\)
\(\Rightarrow3^{2x-4}-1=8\)
\(\Rightarrow3^{2x-4}=9\)
\(\Rightarrow3^{2x-4}=3^2\)
\(\Rightarrow2x-4=2\)
\(\Rightarrow2x=6\)
\(\Rightarrow x=3\)
g) \(65-4^{x+2}=2014^0\)
\(\Rightarrow65-4^{x+2}=1\)
\(\Rightarrow4^{x+2}=64\)
\(\Rightarrow4^{x+2}=4^3\)
\(\Rightarrow x+2=3\)
\(\Rightarrow x=1\)
i) \(120+2\left(4x-17\right)=214\)
\(\Rightarrow2\left(4x-17\right)=214-120\)
\(\Rightarrow2\left(4x-17\right)=94\)
\(\Rightarrow4x-17=47\)
\(\Rightarrow4x=47+17\)
\(\Rightarrow4x=64\)
\(\Rightarrow x=16\)
a: \(8x+56:14=60\)
=>8x+4=60
=>8x=60-4=56
=>x=56/8=7
b: \(5^{2x-3}-2\cdot5^2=5^2\cdot3\)
=>\(5^{2x-3}=5^2\cdot3+2\cdot5^2=5^3\)
=>2x-3=3
=>2x=6
=>x=3
c: \(41-2^{x+1}=9\)
=>\(2^{x+1}=41-9=32\)
=>x+1=5
=>x=4
d: \(3^{2x-4}-x^0=8\)
=>\(3^{2x-4}-1=8\)
=>\(3^{2x-4}=8+1=9\)
=>2x-4=2
=>2x=6
=>x=3
g: \(65-4^{x+2}=2014^0\)
=>\(65-4^{x+2}=1\)
=>\(4^{x+2}=65-1=64\)
=>x+2=3
=>x=1
i: 120+2(4x-17)=214
=>2(4x-17)=214-120=94
=>4x-17=94/2=47
=>4x=64
=>\(x=\dfrac{64}{4}=16\)
`@` `\text {Ans}`
`\downarrow`
`32 \times (x + 3) = 8`
`=> x + 3 = 8 \div 32`
`=> x + 3 = 1/4`
`=> x = 1/4 - 3`
`=> x = -11/4`
Vậy, `x = -11/4.`
13 x 58 x 4 + 32x 36 x2 + 52 x10
= 58 x 52 + 32x 36 x2 + 52 x10
= 52 x ( 58 + 10 ) + 32 x 36 x 2
= 52 x 68 + 2304
= 3536 + 2304 = 5840
Hok tốt
13 . 58 .4 + 32 . 36 . 2 + 52 . 10 = 5840 nhé!
Chúc bạn học tốt!
\(=71.32.2-32.\left(-7\right)-32.\left(-11\right)\)
\(=142.32+32.7+32.11\)
\(=32.\left(142+7+11\right)\)
\(=32.160=5120\)
CHÚC BẠN HỌC TỐT..........
Lời giải:
$3^{2x}=27.3^x$
$\Rightarrow 3^{2x}=3^3.3^x=3^{3+x}$
$\Rightarrow 2x=3+x$
$\Rightarrow x=3$
32x+6=910
⇒ 32x+6=(32)10
⇒ 32x+6=32.10
⇒ 32x+6=320
⇒ 2x+6=20
⇒ 2x= 20-6=14
⇒ x=14:2=7
3^2x-4 -x^0 = 8
(3^2)^x : 3^4 -1 = 8
9^x : 81 =8 + 1
9^x : 81 =9
9^x = 9 . 81
9^x = 729
=>x=3
vậy x=3
\(3^{2x-4}-x^0=8\)
\(\Leftrightarrow3^{2x-4}-1=8\)
\(\Leftrightarrow3^{2x-4}=9\)
\(\Leftrightarrow3^{2x-4}=3^2\)
\(\Rightarrow2x-4=2\)
\(\Rightarrow2x=6\)
\(\Rightarrow x=3\)