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a) 413 . 526
= 413 . 513.2
= 413 . 2513
=10013
b) 420 . 810
=42.10 . 810
=1610.810
=12810
c) 2715 : 910
=33.15 : 32.10
=345-20
=325
a125^5:25^3=(5^3)^5:(5^2)^3=5^15:5^6=5^9
b27^6:9^3=(3^3)^6:(3^2)^3=3^18:3^6=3^13
c 4^20:2^15=(2^2)^20:2^15=2^40:2^15=2^25
d24^n:2^2.n=24^n:(2^2)^n=24^n:4^n=(24:4)^n=6^n
e 64^4 . 16^5:4^20=(2^6)^4 . (2^4)^5 :(2^2)^20=2^24 . 2^20:2^40=2^4
g 32^4:8^6=(2^5)^4:(2^3)^6=2^20:2^18=2^2
a, \(125^5:25^3=\left(5^3\right)^5:\left(5^2\right)^3=5^{15}:5^6=5^9\)
b, \(27^6:9^3=\left(3^3\right)^6:\left(3^2\right)^3=3^{18}:3^6=3^{12}\)
c, \(4^{20}:2^{15}=\left(2^2\right)^{20}:2^{15}=2^{40}:2^{15}=2^{25}\)
d, \(24^n:2^{2.n}=2^n.12^n:2^n.2^n=12^n:2^n=2^n.6^n:2^n=6^n\)
e, \(64^4.16^5:4^{20}=4^{12}.4^{10}:4^{20}=4^{12+10-20}=4^2\)
g, \(32^4:8^6=8^4.4^4:8^4.8^2=4^4:4^2.2^2=4^2.2^2=2^4.2^2=2^6\)
a) \(^{25^2}\).\(5^2\)=\(\left(5^2\right)^2\).5\(^2\)=\(^{5^4}\).\(5^2\)=5\(^6\)
b)9\(^2\).9.27 = 9\(^2\).9.9\(^3\)=9\(^6\)
c)4\(^3\).4.8=\(4^3\).4.4\(^2\)=4\(^6\)
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a) x\(^2\)=7\(^2\)→x = 7
b)x\(^3\)=4\(^3\)→x=4
c)x\(^4\)=2\(^4\)→x=2
d)\(\left(x+1\right)^2\)=5\(^2\)→x+1=5→x=4
e) x \(\in\Phi\)
đăng từng bài thui bạn êi ~.~
\(a)\)\(4x^3+12=120\)
\(\Leftrightarrow\)\(4x^3=108\)
\(\Leftrightarrow\)\(x^3=27\)
\(\Leftrightarrow\)\(x^3=3^3\)
\(\Leftrightarrow\)\(x=3\)
Vậy \(x=3\)
\(b)\) \(\left(4x-1\right)^2=25.9\)
\(\Leftrightarrow\)\(\left(4x-1\right)^2=5^2.3^2\)
\(\Leftrightarrow\)\(\left(4x-1\right)^2=\left(5.3\right)^2\)
\(\Leftrightarrow\)\(\left(4x-1\right)^2=15^2\)
\(\Leftrightarrow\)\(\orbr{\begin{cases}4x-1=15\\4x-1=-15\end{cases}\Leftrightarrow\orbr{\begin{cases}4x=16\\4x=-14\end{cases}}}\)
\(\Leftrightarrow\)\(\orbr{\begin{cases}x=\frac{16}{4}\\x=\frac{-14}{4}\end{cases}\Leftrightarrow\orbr{\begin{cases}x=4\\x=\frac{-7}{2}\end{cases}}}\)
Vậy \(x=4\) hoặc \(x=\frac{-7}{2}\)
Chúc bạn học tốt ~
\(\left(2x-15\right)^{15}=\left(2x-15\right)^3\)
\(\Leftrightarrow\)\(\left(2x-15\right)^{15}-\left(2x-15\right)^3=0\)
\(\Leftrightarrow\)\(\left(2x-15\right)^3[\left(2x-15\right)^{12}-1]=0\)
\(\Leftrightarrow\)\(\left(2x-15\right)^3=0\)
Hoặc \(\left(2x-15\right)^{12}-1=0\)
\(\Leftrightarrow\)\(2x-15=0\)
Hoặc \(\left(2x-15\right)^{12}=1\)
\(\Leftrightarrow\)\(2x=15\)
Hoặc \(\orbr{\begin{cases}2x-15=1\\2x-15=-1\end{cases}\Leftrightarrow\orbr{\begin{cases}2x=16\\2x=14\end{cases}}}\)
\(\Leftrightarrow\)\(x=\frac{15}{2}=7,5\)
Hoặc \(\orbr{\begin{cases}x=\frac{16}{2}\\x=\frac{14}{2}\end{cases}\Leftrightarrow\orbr{\begin{cases}x=8\\x=7\end{cases}}}\)
Vậy \(x=7\)\(;\)\(x=7,5\) hoặc \(x=8\)
Chúc bạn học tốt ~
a,4^16
60^15
x^5050
tich cho minh
pheaeeeeeeeeeeeeeeeeeeeeeeeeeeee
4^13=2^26
2^26x5^26=10^26
Các bài kia tương tự
a) \(4^{13}.5^{26}=\left(2^2\right)^{13}.5^{26}=2^{26}.5^{26}=\left(2.5\right)^{26}=10^{26}\)
b) \(9^{20}:\left(0,375\right)^{40}=\left(3^2\right)^{20}:\left(0,375\right)^{40}=3^{40}:\left(0,375\right)^{40}=\left(3:0,375\right)^{40}=8^{40}\)
c) \(27^{15}:9^{10}=\left(3^3\right)^{15}:\left(3^2\right)^{10}=3^{45}:3^{20}=3^{25}\)