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minh co gang lam tung buoc nho cho ban hieu.
\(4-\left(x-\frac{1}{2}\right)-3\left(5-x\right)=0\)
{nhan pp pha ngoac
\(4-x+\frac{1}{2}-3.5+3.x=0\)
{gom cac so hang, hang so chuyen ben tay phai}
\(\left(3x-x\right)=3.5-4-\frac{1}{2}=15-4-\frac{1}{2}=11-\frac{1}{2}=\frac{21}{2}\)
\(2x=\frac{21}{2}\Rightarrow x=\frac{21}{2}:\frac{2}{1}=\frac{21}{2}.\frac{1}{2}=\frac{21}{4}\)
\(x=\frac{21}{4}\)
=\(\frac{0,8}{0,4^5.0,4}\)= (\(\frac{0,8}{0,4}\))^5 .\(\frac{1}{0,4}\)
= 2 5 .\(\frac{1}{0,4}\)=80
a: \(=\left(\dfrac{5^4}{5^2\cdot7^2}\right)^{15}:\left(\dfrac{5^6}{2\cdot7\cdot31}\right)^7\)
\(=\dfrac{5^{30}}{7^{30}}:\dfrac{5^{42}}{2^7\cdot7^7\cdot31^7}\)
\(=\dfrac{5^{30}}{7^{30}}\cdot\dfrac{2^7\cdot7^7\cdot31^7}{5^{42}}=\dfrac{2^7\cdot31^7}{7^{23}\cdot5^{12}}\)
b: \(=\dfrac{7^{48}\cdot5^{30}\cdot2^8-5^{30}\cdot7^{49}\cdot2^{10}}{5^{29}\cdot2^8\cdot7^{48}}\)
\(=\dfrac{7^{48}\cdot5^{30}\cdot2^8\left(1-7\cdot4\right)}{5^{29}\cdot2^8\cdot7^{48}}=5\cdot\left(-27\right)=-135\)
b) \(9^5=3^{2\cdot5}=3^{10}\)
\(27^3=3^{3\cdot3}=3^9\)
=> tự kết luận
c) \(\left(\frac{1}{8}\right)^6=\left(\frac{1}{2}^3\right)^6=\left(\frac{1}{2}\right)^{18}\)
\(\left(\frac{1}{32}\right)^4=\left(\frac{1}{2}^5\right)^4=\left(\frac{1}{2}\right)^{20}\)
=> tự kết luận
b) Ta có: \(9^5=\left(3^2\right)^5=3^{10}\)
\(27^3=\left(3^3\right)^3=3^9\)
Vì 10 > 9 => 310 > 39
Vậy 95 > 273
1. So sánh :
b) 9^5 và 27^3
9^5 = ( 3^2 )^5 = 3^10
27^3 = ( 3^3 )^3 = 3^9
Vì 3^10 > 3^9 => 9^5 > 27^3
Vậy 9^5 > 27^3
c) \(\left(\frac{1}{8}\right)^6\)và \(\left(\frac{1}{32}\right)^4\)
\(\left(\frac{1}{8}\right)^6=\left(\frac{1}{2}\right)^{3.6}=\left(\frac{1}{2}\right)^{18}\)
\(\left(\frac{1}{32}\right)^4=\left(\frac{1}{2}\right)^{5.4}=\left(\frac{1}{2}\right)^{20}\)
Vì ( 1/2)^18 < (1/2)^20 => (1/8)^6 < (1/32)^4
Vậy (1/8)^6 < (1/32)^4
\(1,\\ a,2< 3\Rightarrow2^{30}< 3^{30}\Rightarrow-2^{30}>-3^{30}\\ b,6^{10}=6^{2\cdot5}=\left(6^2\right)^5=36^5>35^5\left(36>35\right)\)
\(2,\\ a,\dfrac{\left(-3\right)^{10}\cdot15^5}{25^3\cdot\left(-9\right)^7}=\dfrac{3^{10}\cdot5^5\cdot3^5}{5^6\cdot3^{14}}=\dfrac{3}{5}\\ b,\left(8x-1\right)^{2x+1}=5^{2x+1}\\ \Leftrightarrow8x-1=5\\ \Leftrightarrow x=\dfrac{3}{4}\)
Bài 2:
a: Ta có: \(\dfrac{\left(-3\right)^{10}\cdot15^5}{25^3\cdot\left(-9\right)^7}\)
\(=\dfrac{-3^{10}\cdot3^5\cdot5^5}{5^6\cdot3^{14}}\)
\(=-\dfrac{3}{5}\)
b: Ta có: \(\left(8x-1\right)^{2x+1}=5^{2x+1}\)
\(\Leftrightarrow8x-1=5\)
\(\Leftrightarrow8x=6\)
hay \(x=\dfrac{3}{4}\)
Các bạn giúp mik giải bài 1 thôi cũng được vì bài 2 mik lm đc rồi. Hiện tại mik đag cần gấp giúp mik với
\(20^x\div14^x=\left(\frac{20}{14}\right)^x=\left(\frac{10}{7}\right)^x=\frac{10}{7}x\)
Mình biết kết quả là x = 1 nhưng chưa tìm ra cách giải, bạn cố gắng tìm nốt nhé!
a) Ta có :\(\left(\frac{-1}{5}\right)^{300}=\frac{-1^{300}}{5^{300}}=\frac{1}{125^{100}}\)
\(\left(\frac{-1}{3}\right)^{500}=\frac{-1^{500}}{3^{500}}=\frac{1}{243^{100}}\)
Mà \(\frac{1}{125^{100}}>\frac{1}{243^{100}}\)
\(\Rightarrow\left(\frac{-1}{5}\right)^{300}>\left(\frac{-1}{3}\right)^{500}\)
b)Ta có :\(2^{90}=\left(2^{15}\right)^6=32768^6\)
\(5^{36}=\left(5^6\right)^6=15625^6\)
Vì \(32768^6>15625^6\Rightarrow2^{90}>5^{36}\)
a.Ta có: \(\left(\frac{-1}{5}\right)^{300}=\left(\frac{-1}{5}^3\right)^{100}=\left(\frac{-1}{125}\right)^{100}=\left(\frac{1}{125}\right)^{100}\)
\(\left(\frac{-1}{3}\right)^{500}=\left(\frac{-1}{3}^5\right)^{100}=\left(\frac{-1}{243}\right)^{100}=\left(\frac{1}{234}\right)^{100}\)
Mà: \(\frac{1}{125}>\frac{1}{234}\Rightarrow\left(\frac{1}{125}\right)^{100}>\left(\frac{1}{234}\right)^{100}\)
Vậy \(\left(\frac{-1}{5}\right)^{300}>\left(\frac{-1}{3}\right)^{500}\)
b.Ta có: \(2^{90}=\left(2^{10}\right)^9=1024^9\)
\(5^{36}=\left(5^4\right)^9=625^9\)
Mặt khác: \(1024>625\Rightarrow1024^9>625^9\)
Vậy \(2^{90}>5^{36}\)
\(\frac{4}{5}-|x-\frac{1}{6}|=\frac{2}{3}\)
\(\Rightarrow|x-\frac{1}{6}|=\frac{2}{15}\)
\(\Rightarrow\orbr{\begin{cases}x-\frac{1}{6}=\frac{2}{15}\\x-\frac{1}{6}=-\frac{2}{15}\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=\frac{3}{10}\\x=\frac{1}{30}\end{cases}}\)
Vậy.....
Giải :
Ta có :
56 = ( 53 )2 = 1252
( -2 )14 = 214 = ( 27 )2 = 1282
Vì 1252 < 1282 => 56 < ( -2 )14
~~Học tốt~~
5^6=15625
(-2)^14=16384
=>(-2)^14>5^6