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a) 4.52-3.23 = 22.52-3.23 = 22.(52-3.2) =22.(25-6) = 4.19 = 76
b) 28.76 + 13.28 + 9.2
= 28. (76 + 13) + 18
= 28. 89 + 18
= 2492 + 18
= 2510
c) 1024: ( 17 .25+15.25)
= 210 : [25.(17+15)]
= 210: [25. 32]
= 210: [25.25)
= 210:210
= 1
a) 4.52-3.23
=22.52-3.23
=22.(25-6)
=4.11
=44
b) 28.76+13.28+9.2
=28.(76+13)+9.2
=28.89+9.2
=2.(1246+9)
=2.1255
=2510
c) 1024:(17.25+15.25)
=1024:25.(17+15)
=1024:32.32
=1
a) 27^16 : 9^10
Ta có: (3.9)^16 : 9^10
= 3^16.9^16: 9^10
= 3^16. 9^6
= 3^16.(3^2)^6
=3^16.3^12
=3^28
Ta có :
\(A=\frac{8^{24}.1215}{2^5.432}\)
\(\Rightarrow A=\frac{\left(2^3\right)^{24}.\left(3^5.5\right)}{2^5.\left(2^4.3^3\right)}\)
\(\Rightarrow A=\frac{2^{72}.3^5.5}{2^5.2^4.3^3}\)
\(\Rightarrow A=\frac{2^{72}.3^5.5}{2^9.3^3}\)
\(\Rightarrow A=\frac{2^{63}.3^2.5}{1.1}\)
\(\Rightarrow A=2^{63}.9.5\)
\(\Rightarrow A=2^{63}.45\)
Vậy \(A=2^{63}.45\)
~ Ủng hộ nhé
Ta có :
\(B=\frac{15^5.12^{10}}{6^8.9^3}\)
\(\Rightarrow B=\frac{\left(3.5\right)^5.\left(2^2.3\right)^{10}}{\left(2.3\right)^8.\left(3^2\right)^3}\)
\(\Rightarrow B=\frac{3^5.5^5.\left(2^2\right)^{10}.3^{10}}{2^8.3^8.3^6}\)
\(\Rightarrow B=\frac{3^{15}.5^5.2^{20}}{2^8.3^{14}}\)
\(\Rightarrow B=\frac{3.3125.2^{12}}{1.1}\)
\(\Rightarrow B=3.3125.4096\)
\(\Rightarrow B=38400000\)
Vậy \(B=38400000\)
a) \(5.\left(x-3\right)=15\)
\(x-3=15:5\)
\(x-3=3\)
\(x=6\)
b)\(10+2.x=4^5:4^3\)
\(10+2.x=16\)
\(2x=16-10\)
\(2x=6\)
\(x=3\)
c) \(5^{x+1}=125\)
\(5^{x+1}=5^3\)
\(x+1=3\)
\(x=2\)
d) \(5^{2x-3}-2.5^2=5^2.3\)
\(5^{2x-3}=2.5^2+5^2.3\)
\(5^{2x-3}=125\)
\(5^{2x-3}=5^2\)
\(2x-3=2\)
\(2x=6\)
\(x=3\)
Mk nhanh nek bn
a,12^8:12^4=122 ( sai )
b, 5^9=15 ( sai )
c, 5^3.5^2=5^5 ( đúng )
=> có câu c, đúng còn câu a, và b, là sai .
a, S
b, S
c, Đ
k mình nhé