6 + 24 + 9 + 30 + 52 + 748 = ?
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1) \(373737.73-37.737373\)
\(=37.10101.73-37.73.10101\)
\(=0\)
2) \(19.41414141-41.19191919\)
\(=19.41.1010101-41.19.1010101\)
\(=0\)
3) \(123456.456789456789-456789.123456123456\)
\(=123456.456789.1000001-456789.123456.1000001\)
\(=0\)
4) \(250.12.7\)
\(=250.4.3.7\)
\(=\left(250.4\right).\left(3.7\right)\)
\(=1000.21\)
\(=21000\)
5) \(24.125.9\)
\(=3.8.125.9\)
\(=\left(3.9\right).\left(8.125\right)\)
\(=27.1000\)
\(=27000\)
6) \(125.44.18\)
\(=125.4.11.2.9\)
\(=\left(125.4.2\right).\left(11.9\right)\)
\(=1000.99\)
\(=99000\)
7) \(8.24.6+12.4.52+2.22.24\)
\(=48.24+48.52+48.22\)
\(=48\left(24+52+22\right)\)
\(=48.98\)
\(=48\left(100-2\right)\)
\(=48.100-48.2\)
\(=4800-96\)
\(=4704\)
8) \(18.58.2-9.27.4+12.69.3\)
\(=36.58-36.27+36.69\)
\(=36\left(58-27+69\right)\)
\(=36.100=3600\)
9) \(30.85.3+18.72.5-45.37.2-9.20.10\)
\(=90.85+90.72-90.37-90.20\)
\(=90\left(85+72-37-20\right)\)
\(=90.100=9000\)
30 + 6 = 36 60 + 9 = 69 52 + 6 = 58 82 + 3 = 85
40 + 5 = 45 70 + 2 = 72 6 + 52= 58 3 + 82 = 85
30 + 6 = 36 60 + 9 = 69 52 + 6 = 58 83 + 2 = 85 40 + 5 = 45 70 + 2 = 72 6 + 52 = 58 3 + 82 = 85
a. \(\begin{matrix}24=2^3.3\\10=2.5\end{matrix}\Rightarrow BCNN_{\left(24;10\right)}=2^3.3.5=120\)
Vậy...........
b. \(\begin{matrix}9=3^2\\24=2^3.3\end{matrix}\Rightarrow BCNN_{\left(9;24\right)}=2^3.3^2=72\)
Vậy...........
c, \(\begin{matrix}14=2.7\\21=3.7\\56=2^3.7\end{matrix}\Rightarrow BCNN_{\left(14;21;56\right)}=2^3.3.7=168\)
Vậy.........
d. \(\begin{matrix}8=2^3\\12=2^2.3\\15=3.5\end{matrix}\Rightarrow BCNN_{\left(8;12;15\right)}=2^3.3.5=120\)
Vậy........
e. \(\begin{matrix}12=2^2.3\\52=2^2.13\end{matrix}\Rightarrow BCNN_{\left(12;52\right)}=2^2.3.13=156\)
Vậy......
g. \(\begin{matrix}6=2.3\\8=2^3\\10=2.5\end{matrix}\Rightarrow BCNN_{\left(6;8;10\right)}=2^3.3.5=120\)
Vậy.........
h. \(\begin{matrix}9=3^2\\24=2^3.3\\35=5.7\end{matrix}\Rightarrow BCNN_{\left(9;24;35\right)}=2^3.3^2.5.7=2520\)
Vậy...........
\(1+5^2+5^4+...+5^{2x}\left(1\right)=\dfrac{25^6-1}{24}\)
Đặt \(\left(1\right)=A\)
\(\Rightarrow A=1+5^2+...+5^{2x}\)
\(\Rightarrow5^2A=5^2+5^4+...+5^{2x+2}\)
\(\Rightarrow25A=5^2+5^4+...+5^{2x+2}\)
\(\Rightarrow25A-A=5^2+5^4+...+5^{2x+2}-1-5^2-...-5^{2x}\)
\(\Rightarrow24A=5^{2x+2}-1\)
\(\Rightarrow A=\dfrac{5^{2x+2}-1}{24}\)
Mà: \(A=\dfrac{25^6-1}{24}\)
\(\Rightarrow\dfrac{5^{2x+2}-1}{24}=\dfrac{\left(5^2\right)^6-1}{24}\)
\(\Rightarrow5^{2x+2}-1=5^{12}-1\)
\(\Rightarrow5^{2x+2}=5^{12}\)
\(\Rightarrow2x+2=12\)
\(\Rightarrow2x=10\)
\(\Rightarrow x=\dfrac{10}{2}\)
\(\Rightarrow x=5\)
Ta có:8=23
10=2.5
24=24.5
BCNN(...)=23.5=24.5=40
b)Ta có:
16=24
24=23.3
BCNN(...)=24.3=48
c)Ta có:
60=22.3.5
140=22.5.7
BCNN(...)=22.3.5.7=420
Mấy bài sau bn cứ lm như thế này nhé^^
6 + 24 + 9 + 30 + 52 + 748 = 869
6+24+9+30+52+748=869
Ủng hô mk nka!!! ^_^