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=> -5 + x - 10 + 4 = -5 + x - 10 + 4
= -5 + x - 10 + 4 + 5 - x + 10 -4
= [( - 5 ) + 5] + [x + (-x)] + [(-10) + 10] + [4 + (-4)]
= 0 + 0 + 0 + 0
HỌC TỐT !
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\(A=\dfrac{2^{20}\cdot3^{10}\cdot35+2^{10}\cdot65+2^2\cdot3^2\cdot2^{12}\cdot3^6\cdot3^2\cdot5^2}{2^{12}\cdot5^4}\)
\(=\dfrac{2^{10}\left(2^{10}\cdot3^{10}\cdot35+65+2^4\cdot3^{10}\cdot5^2\right)}{2^{12}\cdot5^4}\)
\(=\dfrac{1}{4}\cdot\dfrac{2^4\cdot3^{10}\cdot5\cdot\left(2^6\cdot7+5\right)+65}{5^4}\)
\(=\dfrac{1}{4}\cdot\dfrac{2^4\cdot3^{11}\cdot5\cdot151+65}{5^4}\)
\(=\dfrac{1}{4}\cdot\dfrac{2^4\cdot3^{11}\cdot151+13}{5^3}=\dfrac{2^4\cdot3^{11}\cdot151+13}{500}\)
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dễ lắm bạn
\(\frac{4^7}{4^{10}}\)=\(\frac{1}{4^3}\) vì 4^7 : 4^7=1;4^10:4^7=4^3
\(\frac{5^{11}}{5^8}\)=\(5^3\)vì 5^11:5^8=5^3;5^8:5^8=1
chỉ tke thui.mấy cái gạch kia bỏ đi vì mk chưa sử dụng phần mềm rành lắm
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Rút gọn A= 2^19 x 27^3 + 15 x 4^9 x 9^4 / 6^9 x 2^10 + 2^10
bạn tick mình đi bạn
![](https://rs.olm.vn/images/avt/0.png?1311)
[url=http://Blog.Uhm.vN][img]http://blog.uhm.vn/emo/bobototo/44.gif[/img][/url]
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\(\frac{2^{12}.13+2^{12}.65}{2^{10}.104}+\frac{3^{10}.11+3^{10}.5}{3^9.2^4}\)
\(\Rightarrow\frac{2^{12}.\left(13+65\right)}{2^{10}.104}+\frac{3^{10}.\left(11+5\right)}{3^9.2^4}\)
\(\Rightarrow\frac{2^{12}.78}{2^{10}.104}+\frac{3^{10}.2^4}{3^9.2^4}\)
\(=\frac{2^2.3}{4}+3\)
\(=3+3=6\)
thực hiện biến đỏi ta có :