Làm phép tính :
a) ( 523. 518 ) : 539 - 50 . 05
b)[2.3mũ 3 + 144: (7mũ 2 - 925: 5 mũ 2 )]. gttđ của -8
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a) \(7^5.7^6=7^{5+6}=7^{11}\)
b) \(5^{20}.5=5^{20+1}=5^{21}\)
c) \(7^9:7=7^{9-1}=7^8\)
d) \(25^3.5^2=\left(5^2\right)^3.5^2=5^{2.3}.5^2=5^6.5^2=5^{6+2}=5^8\)
a)\(3^2.9^3=9.9^3=9^{1+3}=9^4\)
b)\(2^2.5^2=4.25=100=10^2\)
c)\(8^5.2^3=8^5.8=8^{5+1}=8^6\)
d)\(9^8:3^2=9^8:9=9^{8-1}=9^7\)
Câu a )
\(-\frac{3}{5}+\frac{9}{16}+-\frac{2}{5}+\frac{7}{16}=\left(-\frac{3}{5}+-\frac{2}{5}\right)+\left(\frac{9}{16}+\frac{7}{16}\right).\)
\(=\left(-1\right)+1=0\)
hk tốt !
a)\(\left(5^{23}.5^{18}\right):5^{39}-5^0.0^5\)
= \(5^{41}:5^{39}-1.0\)
= \(5^2-0\)
= \(25-0=25\)
b)\(\left[2.3^3+144:\left(7^2-925:5^2\right)\right].\left|-8\right|\)
= \(\left[2.27+144:\left(49-925:25\right)\right].8\)
= \(\left[54+144:\left(49-37\right)\right].8\)
= \(\left[54+144:12\right].8\)
= \(\left[54+12\right].8\)
= \(66.8\)
= 528