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\(A=2^5.5^2-8^2-7=800-64-7=729=27^2\)
\(B=2^3.4^2+3^2.3^2-40=128+81-40=169=13^2\)
\(C=11.2^4+6^2.19+40=176+684+40=900=30^2\)
\(D=4^3+6^3+7^3+2=64+216+343+2=625=25^2\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a,-\dfrac{10}{21}=\dfrac{-2}{7}.\dfrac{5}{3}=\dfrac{-2}{3}.\dfrac{5}{7}\\ b,\dfrac{2}{21}=\dfrac{1}{3}.\dfrac{2}{7}=\dfrac{1}{7}.\dfrac{2}{3}\\ c,\dfrac{8}{15}=\dfrac{2}{3}.\dfrac{4}{5}=\dfrac{4}{3}.\dfrac{2}{5}\)
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a) Vì 18 = 2. 7 + 4 nên 18 7 = 2 4 7
b ) 15 4 = 3 3 74 . c ) − 7 3 = − 2 1 3 . d ) 23 − 4 = − 5 3 4
![](https://rs.olm.vn/images/avt/0.png?1311)
hellooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo mấy dứa dở
a ) 7 3 = 2 + 1 3 = 2 1 3
b ) 15 4 = 3 + 3 4 = 3 3 4
c ) − 8 3 = − 2 2 3
d ) − 23 5 = − 5 3 4