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C1:
a) 2^10: 2^8=1024: 256= 4
b) 4^6 : 4^3 = 4096: 64 = 64
c) 8^5 : 8^4 = 32768 : 4096 = 8
d) 7^4 : 7^4 = 2401: 2401= 1
C2
a) 2^10 : 2^8 = 2^2 = 4
b) 4^6 : 4^3 = 4^3 = 64
c) 8^5 : 8^4 = 8
d) 7^4 : 7^4 = 1
Bài 1:
a) \(8^5\cdot8^2=8^7\)
b) \(9^3\cdot3^2=\left(3^2\right)^3\cdot3^2=3^6\cdot3^2=3^8\)
c) \(2^7\cdot5^7=10^7\)
d) \(27^6:3^3=\left(3^3\right)^6:3^3=3^{18}:3^3=3^{15}\)
Bài 2:
a) \(x^6:x^3=125\)
\(\Rightarrow x^3=125\)
\(\Rightarrow x=5\)
b) \(x^{20}=x\)
\(\Rightarrow x^{20}-x=0\)
\(\Rightarrow x\left(x^{19}-1\right)=0\)
\(\Rightarrow\left[{}\begin{matrix}x=0\\x^{19}-1=0\Rightarrow x=1\end{matrix}\right.\)
c) \(3^x\cdot3=243\)
\(\Rightarrow3^x=81\)
\(\Rightarrow x=4\)
d) \(2x-138=2^3\cdot3^2\)
\(\Rightarrow2x-138=72\)
\(\Rightarrow2x=200\)
\(\Rightarrow x=100\)
Giải:
Bài 1:
a) \(8^5.8^2=8^{5+2}=8^7\)
b) \(9^3.3^2=3^6.3^2=3^{6+2}=3^8\)
c) \(2^7.5^7=\left(2.5\right)^7=10^7\)
d) \(27^6:3^3=3^{18}:3^3=3^{18-3}=3^{15}\)
Bài 2:
a) \(x^6:x^3=x^{6-3}=x^3=125\)
\(\Leftrightarrow x=5\)
b) \(x^{20}=x\)
\(\Leftrightarrow\left[{}\begin{matrix}x=0\\x=-1\\x=1\end{matrix}\right.\)
c) \(3^x.3=243\)
\(\Leftrightarrow3^{x+1}=243\)
\(\Leftrightarrow3^{x+1}=3^5\)
\(\Leftrightarrow x+1=5\Leftrightarrow x=4\)
d) \(2.x-138=2^3.3^2\)
\(\Leftrightarrow2.x-138=8.9\)
\(\Leftrightarrow2.x-138=72\)
\(\Leftrightarrow2.x=72+138\)
\(\Leftrightarrow2.x=210\Leftrightarrow x=105\)
Chúc bạn học tốt!
1) C1: 8^5 : 8^4 = 32768 : 4096 = 8
C2: 8^5 : 8^4 = 8^ 5-4 = 8^1 = 8
2) C1: 7^4 : 7^4 = 2401 : 2401 = 1
C2: 7^4 : 7^4 = 7^4-4 = 7^0 = 1
cho mk nha.
a) \(2^{10}:2^8=1024:256=4\)
\(2^{10}:2^8=2^{10-8}=2^2=4\)
b) \(4^6:4^3=4096:64=64\)
\(4^6:4^3=4^{6-3}=4^3=64\)
c) \(8^5:8^4=32768:4096=8\)
\(8^5:8^4=8^{5-4}=8\)
d) \(7^4:7^2=2401:49=49\)
\(7^4:7^2=7^{4-2}=7^2=49\)
Bài 2
\(2^{10}:2^8=2^{10-8}=2^2=4\)
\(4^6:4^3=4^{6-3}=4^3=64\)
\(8^5-8^4=8^{5-4}=8^1=8\)
\(7^4:7^2=7^{4-2}=7^2=49\)
a) Cách 1: 1024 : 256 = 4.
Cách 2: 210 : 28 = 210 – 8 = 22 = 4;
b) Cách 1: 4096 : 64 = 64.
Cách 2: 46 : 43 = 46 – 3 = 43 = 64;
c) Cách 1: 32768 : 4096 = 8.
Cách 2: 85 : 84 = 85 – 4 = 81 = 8;
d) Cách 1: 2401 : 2401 = 1.
Cách 2: 74 : 74 = 74 – 4 = 70 = 1.
a) \(2^{10}:2^8=1024:256=4\)
\(2^{10}:2^8=2^{10-8}=2^2=4\)
b) \(4^6:4^3=4096:64=64\)
\(4^6:4^3=4^{6-3}=4^3=64\)
c) \(8^5:8^4=32768:4096=8\)
\(8^5:8^4=8^{5-4}=8\)
d) \(\frac{7}{7^4}=\frac{1}{7^3}=\frac{1}{343}\)
\(7:7^4=7:2401=\frac{1}{343}\)