5^20 : (5^15.6 + 5^15.19)
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520 : (515.6 + 515.19)
= 520 : [515(6 + 9)]
= 520 : (515.15)
= \(\frac{625}{3}\)
520 : (515.6+515.19)
=520:[515.(6+19)]
=520:[515.25]
=520:[515.52 ]
=520:[515+2 ]
=520 : 517
=520-17
=53
=125
chúc bạn học tốt
=5^20:[5^15(6+9)]
=5^20:[5^15.15]
=5^20.[1/5^15.1/15)
=5^20.1/5^15.1/15
=5^20:5^15.1/15
=5^20-15.1/15
=5^5.1/15
=5^5/15
=5.5^4/5.3
=5^4/3
(=625/3)
\(5^{20}:\left(5^{15}.6+5^{15}.9\right)\\ =5^{20}:\left[5^{15}\left(6+9\right)\right]\\ =5^{20}:\left(5^{15}.15\right)\\ =5^{20}:\left(5^{15}.5.3\right)\\ =5^{20}:\left(5^{16}.3\right)\\ =5^4:3\\ =625:3\\ =\dfrac{625}{3}\)
791:789+5.52-124
=791:789+5.25-124
=791-89+125-124
=72+125-124
=49+125-124
=174-124
=50
4.15+28:7-620:618
=60+4-620-18
=64-62
=64-36
=28
(32+23):7
=(9+8):7
=17:7
=17/7
1125:1123-35:(110+23)-60
=1125:1123-35:(1+8)-60
=1125:1123-35:9-60
=1125:1123-35:33-60
=1125-23-35-3-60
=112-32-60
=121-9-60
=112-60
=52
\(V=\frac{1}{2}-\frac{1}{7}+\frac{1}{7}-\frac{1}{15}+\frac{1}{15}-\frac{1}{19}+\frac{1}{19}-\frac{1}{21}+\frac{1}{21}-\frac{1}{30}\)
\(V=\frac{1}{2}-\frac{1}{30}=\frac{15}{30}-\frac{1}{30}=\frac{7}{15}\)
\(\frac{5^{20}}{5^{15.6}+5^{15}.19}\)
mk viết nhầm nha \(\frac{5^{20}}{5^{15.6}+5^{15.19}}=\frac{5^{20}}{5^{90}+5^{285}}\)