a) 4

b) 80

c) 243

d) 9

bạn tự giải ra nhé!mk làm tắt thui

a) (0.8)^5:(0,4)^6

   =(0,4)^10:(0,4)^6

   = (0,4)^4

b)  (0,125)^3*512

   = 1

c)45^10*5^20/75^15

=243

d) 2^15*9^4/6^6*8^3

=2359296

nhận đúng cho mk nha

\(\dfrac{45^{10}\cdot5^{20}}{75^{15}}=\dfrac{\left(3^2\cdot5\right)^{10}\cdot5^{20}}{\left(3\cdot5^2\right)^{15}}=\dfrac{3^{20}\cdot5^{10}\cdot5^{20}}{3^{15}\cdot5^{30}}=3^5=243\\ \dfrac{6^6+6^3+3^3+3^6}{-73}=\dfrac{46656+216+27+729}{-73}=-\dfrac{47628}{73}\\ \dfrac{27^7+3^{15}}{9^9-27}=\dfrac{\left(3^3\right)^7+3^{15}}{\left(3^2\right)^9-3^3}=\dfrac{3^{21}+3^{15}}{3^{18}-3^3}=\dfrac{3^{15}\left(3^6+1\right)}{3^3\left(3^{15}-1\right)}=\dfrac{3^5\cdot730}{3^{15}-1}\\ \dfrac{8^{20}+4^{20}}{4^{25}+64^5}=\dfrac{\left(2^3\right)^{20}+\left(2^2\right)^{20}}{\left(2^2\right)^{25}+\left(2^6\right)^5}=\dfrac{2^{60}+2^{40}}{2^{50}+2^{30}}=\dfrac{2^{40}\left(2^{20}+1\right)}{2^{30}\left(2^{20}+1\right)}=2^{10}=1024\)

a.4/5+3/15 = 4/5+ 3/15:3=4/5+1/5=5/5

b.2/3+32/24=2/3+32/24:8=2/3+4/3=6/3

c.5/6+15/18=5/6x3+15/18=15/18+15/18=30/18

mn ơi e vít nhầm là tính rồi rút gọn mn sửa lại là rút gọn rùi tính

a: =2/5+3/5=1

b: =1/3+5/6=2/6+5/6=7/6

c: =7/8+5/8=12/8=3/2

d: =2/3+2/10

=20/30+6/30

=26/30=13/15

e: =1/2+1/3

=3/6+2/6

=5/6

f: =2/7+1/6

=12/42+7/42

=19/42

\(9^8:3^2=3^{16}:3^2=3^{14}\)

\(\frac{45^{10}.5^{20}}{75^{15}}=\frac{\left(5.3^2\right)^{10}.5^{20}}{\left(5^2.3\right)^{15}}=\frac{5^{10}.3^{20}.5^{20}}{5^{30}.3^{15}}=3^5\)

\(\frac{2^{15}.9^4}{6^6.8^3}=\frac{2^{15}.3^8}{2^6.3^6.2^9}=\frac{2^{15}.3^8}{2^{15}.3^6}=3^2=9\)

1)   9⁸ : 3² =(3²)⁸:3²=3^2.8:3²=3¹⁶:3²=3^16-2=3¹⁴

2)   (45¹⁰.5²⁰)/75¹⁵=[(5.2³)¹⁰.5²⁰]/(5³)¹⁵=(5¹⁰.2^3.10.5²⁰)/5^3.15=(5³⁰.2³⁰)/5⁴⁵=2³⁰/5¹⁵=(2²)¹⁵/5¹⁵=(4/5)¹⁵

3)   (2¹⁵.9⁴)/(6⁶.8³)=[2¹⁵.(3²)⁴]/[(2.30)....

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hk tốt nha!!!

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