M= 4 mũ 10 + 4 mux11+........+4 mũ 198 +4 mũ 199. CMR Mlaf bội của 5
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\(M=4^{10}+4^{11}+4^{12}+...+4^{198}+4^{199}\)
\(=\left(4^{10}+4^{11}\right)+\left(4^{12}+4^{13}\right)+\left(4^{14}+4^{15}\right)+...+\left(4^{198}+4^{199}\right)\)
\(=4^{10}\left(1+4\right)+4^{12}\left(1+4\right)+4^{14}\left(1+4\right)+...+4^{198}\left(1+4\right)\)
\(=5\left(4^{10}+4^{12}+4^{14}+...+4^{198}\right)\)\(⋮5\)
Vậy M là bội của 5
Bài 1 : a, \(x-18=\left(-67\right)+\left(-13\right)\Leftrightarrow x-18=\left(-80\right)\)
\(\Rightarrow x=\left(-80\right)+18=\left(-62\right)\)
Vậy x = (-62)
b, \(35-\left|x\right|=10\Leftrightarrow\left|x\right|=35-10=25\Leftrightarrow x\in\left\{-25;25\right\}\)
Vậy \(x\in\left\{-25;25\right\}\)
Bài 2 : Đề k đầy đủ :v
Bài 3 : Đặt : \(A=1+4+4^2+4^3+4^4+4^5+4^6+4^7+4^8+4^9\)
\(\Rightarrow A=\left(1+4\right)+\left(4^2+4^3\right)+\left(4^4+4^5\right)+\left(4^6+4^7\right)+\left(4^8+4^9\right)\)
\(\Rightarrow A=\left(1+4\right)+4^2\left(1+4\right)+4^4\left(1+4\right)+4^6\left(1+4\right)+4^8\left(1+4\right)\)
\(\Rightarrow A=1.5+4^2.5+4^4.5+4^6.5+4^8.5=\left(1+4^2+4^4+4^6+4^8\right).5\)
\(\Rightarrow A⋮5\Rightarrow\) A là bội của 5
P/s : Bài 3 đề k đầy đủ mk sửa roy :vv
a) \(A=\left(5+5^2\right)+5^2\left(5+5^2\right)+...+5^6\left(5+5^2\right)=30+5^2.30+...+5^6.30\)
\(=30\left(1+5^2+...+5^6\right)⋮30\Rightarrowđpcm\)
b) \(B=\left(3+3^3+3^5\right)+3^6\left(3+3^3+3^5\right)+...+3^{24}\left(3+3^3+3^5\right)=273+3^6.273+...+3^{24}.273\)
\(=273.\left(1+3^6+...+3^{24}\right)⋮273\Rightarrowđpcm\)
a: \(B=5\left(1+5+5^2+5^3\right)+5^5\left(1+5+5^2+5^3\right)\)
\(=156\cdot5\cdot\left(1+5^4\right)\)
\(=780\left(1+5^4\right)⋮30\)
b: \(B=\left(3+3^3+3^5\right)+...+3^{24}\left(3+3^2+3^5\right)\)
\(=273\cdot\left(1+...+3^{24}\right)⋮273\)
a) \(\dfrac{10^{12}+5^{11}.2^9-5^{13}.2^8}{4.5^5.10^6}\)
\(=\dfrac{2^{12}.5^{12}+5^{11}.2^9-5^{13}.2^8}{2^2.5^5.2^6.5^6}\)
\(=\dfrac{2^{12}.5^{12}+5^{11}.2^9-5^{13}.2^8}{2^8.5^{11}}\)
\(=\dfrac{\left(2^8.5^{11}\right)\left(2^4.5+2-5^2\right)}{2^8.5^{11}}\)
\(=2^4.5+2-5^2\)
\(=57\)
b) \(\dfrac{\left[5\left(x-y\right)^4-3\left(x-y\right)^3+4\left(x-y\right)^2\right]}{\left(y-x\right)^2}\)
\(=\dfrac{\left(x-y\right)^2\left[5\left(x-y\right)^2-3\left(x-y\right)+4\right]}{\left(y-x\right)^2}\)
\(=\dfrac{\left(x^2+y^2-2xy\right)\left[5\left(x-y\right)^2-3\left(x-y\right)+4\right]}{\left(y^2+x^2-2xy\right)}\)
\(=5\left(x-y\right)^2-3\left(x-y\right)+4\)
c) \(\dfrac{\left(x+y\right)^5-2\left(x+y\right)^4+3\left(x+y\right)^3}{-5\left(x+y\right)^3}\)
\(=\dfrac{\left(x+y\right)^3\left[5\left(x+y\right)^2-2\left(x+y\right)+3\right]}{-5\left(x+y\right)^3}\)
\(=\dfrac{5\left(x+y\right)^2-2\left(x+y\right)+3}{-5}\)
\(B=\left(3+3^3+3^5\right)+3^6\left(3+3^3+3^5\right)+.............+3^{24}\left(3+2^3+3^5\right)\)
\(B=273+273\cdot3^6+.............+273\cdot3^{24}\)
\(B=273\left(1+3^6+.......+3^{24}\right)⋮273\)
\(A=4+4^2+...+4^{99}\)
\(\Rightarrow4A=4^2+3^3+...+4^{99}+4^{100}\)
\(\Rightarrow4A-A=4^{100}-4\)
\(\Rightarrow3A=4^{100}-4\Rightarrow A=\frac{4^{100}-4}{3}\)
\(B=5+5^2+...+5^{10}\)
\(5B=5^2+5^3+...+5^{10}+5^{11}\)
\(5B-B=4B=5^{11}-5\Rightarrow B=\frac{5^{11}-5}{4}\)
C đang 6 mũ sao tự nhiên nhảy đâu ra 9 mũ?
Nếu nó là 6 mũ thì làm tương tự như 2 câu trên