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\(\frac{72^3.54^2}{108^4}=\frac{\left(2^3.3^2\right)^3.\left(2.3^3\right)^2}{\left(2^2.3^3\right)^4}\\ =2^3\\ =8\\ \)
tk nha bn
Bài giải
Ta có :
\(2^{91}=2^{90}\cdot2=\left(2^3\right)^{30}\cdot2=8^{30}\cdot2>5^{30}\)
\(\Rightarrow\text{ }2^{91}>5^{30}\)
\(21^8=\left(21^2\right)^4=441^4>54^4\)
\(\Rightarrow\text{ }54^4< 21^8\)
\(108^{50}=\left(108^2\right)^{25}=11664^{25}\)
\(73^{75}=\left(73^3\right)^{25}=389017^{25}\)
\(\text{Vì }11664^{25}< 389017^{25}\text{ }\Rightarrow\text{ }108^{50}< 73^{75}\)
Bài giải
\(2^{91}=2^{90}\cdot2=\left(2^3\right)^{30}\cdot2=8^{30}\cdot2>5^{30}\)
\(\Rightarrow\text{ }2^{91}>5^{30}\)
\(21^8=\left(21^2\right)^4=441^4>54^4\)
\(\Rightarrow\text{ }54^4< 21^8\)
\(108^{50}=\left(108^2\right)^{25}=11664^{25}\)
\(73^{75}=\left(73^3\right)^{25}=389017^{25}\)
\(\text{Vì }11664^{25}< 389017^{25}\text{ }\Rightarrow\text{ }108^{50}< 73^{75}\)
Ta có \(\frac{72^3.54^2}{108^4}=\frac{\left(2^3.3^2\right)^3.\left(3^3.2\right)^2}{\left(3^3.2^2\right)^4}=\frac{2^9.3^6.3^6.2^2}{3^{12}.2^8}=\frac{2^{11}.3^{12}}{3^{12}.2^8}=2^3=8\)
cho mình hỏi lại đề bài bạn ơi!
nếu đề bài là\(D=\frac{72^3.54^2}{108^4}\)thì mình xin được giải bài.
\(D=\frac{72^3.54^2}{108^4}=\frac{\left(2^3\right)^3.\left(3^2\right)^3.2^2.\left(3^3\right)^2}{\left(2^2\right)^4.\left(3^3\right)^4}=\frac{2^9.3^6.2^2.3^6}{2^8.3^{12}}=\frac{2^{11}.3^{12}}{2^8.3^{12}}=2^3=8\)
Vậy \(D=8\)
. 72^3 * 54^2 / 108^4
= 72^3 * 54^2 / (2 * 54)^4
= 72^3 * 54^2 / 2^4 * 54^4
= 72^3 * 54^2 / 2^4 * 54^2 * 54^2
= 72^3 / 2^4 * 54^2
= 72^3 / (2^2)^2 * 54^2
= (9 * 8)^3 / 4^2 * (9 * 6)^2
= 9^3 * 8^3 / 4^2 * 9^2 * 6^2
= 9 * 9^2 * (4 * 2)^3 / 4^2 * 9^2 * 6^2
= 9 * 4^3 * 2^3 / 4^2 * 6^2
= 9 * 4 * 4^2 * 8 / 4^2 * 36
= 9 * 4 * 8 / 36
= 36 * 8 / 36
= 8
\(72^2\cdot54^2:108^4=1088391168:108^4=8\)
k mình
k lại
\(A=\frac{72^3\times54^2}{108^4}\)
\(\Rightarrow A=\frac{\left(2^3\times3^2\right)^3\times54^2}{\left(54\times2\right)^4}\)
\(\Rightarrow A=\frac{\left(2^3\right)^3\times\left(3^2\right)^3\times54^2}{54^4\times2^4}\)
\(\Rightarrow A=\frac{2^9\times3^6\times54^2}{54^2\times54^2\times2^4}\)
\(\Rightarrow A=\frac{2^5\times3^6}{54^2}\)
\(\Rightarrow A=\frac{2^5\times3^6}{\left(2\times3^3\right)^2}\)
\(\Rightarrow A=\frac{2^2\times2^3\times3^6}{2^2\times\left(3^3\right)^2}\)
\(\Rightarrow A=\frac{2^3\times3^6}{3^6}\)
\(\Rightarrow A=2^3=8\)
\(B=\frac{3^{10}\times11+3^{10}\times5}{3^9\times2^4}\)
\(\Rightarrow B=\frac{3^{10}\times\left(11+5\right)}{3^9\times2^4}\)
\(\Rightarrow B=\frac{3^{10}\times16}{3^9\times16}\)
\(\Rightarrow B=\frac{3^{10}}{3^9}=3\)
a. 4^10.8^15=2^20.2^30=2^50
b. 4^15.5^30=2^30.5^30=10^30
c. 27^16:9^10=3^48:3^20=3^28
a) 410.815 = (22)10 . (23)15 = 220 . 245 = 220+45 = 265
b) 415.530 = 415.(52)15 = 415.2515 = (4.25)15 = 10015
c) 2716:910 = (33)16:(32)10 = 348:320 = 348-20 = 328
d) \(A=\frac{72^3.54^2}{108^4}=\frac{\left(8.9\right)^3.\left(6.9\right)^2}{\left(12.9\right)^2}=\frac{8^3.9^3.6^2.9^2}{12^2.9^2}=\frac{8^3.9^3.6^2}{12^2}\)
\(=\frac{\left(2^3\right)^3.9^3.6^2}{\left(2.6\right)^2}=\frac{2^9.9^3.6^2}{2^2.6^2}=\frac{2^9.9^3}{2^2}=\frac{2^7.9^3}{2^0}=2^7.9^3=93312\)
a.1134373572
b.136048896