bài 11

\(6.6.6.6=6^4\) '\(b.5.15.15.15.3=15.15.15.15=15^4\)

\(c.81.3.3.3=3^4.3^3=3^7\)

bài 12.

\(a.765.5=153.5^2\)

\(b.837.7.7=93.21^2\)

\(c.568.8.2.4=71.8.2^6=71.2^9\)

a) \(125^7:25^4=\left(5^3\right)^7:\left(5^2\right)^4=5^{21}:5^8=5^{13}\)

b) \(27^8:9^5=\left(3^3\right)^8:\left(3^2\right)^5=3^{24}:3^{10}=3^{14}\)

c) \(4^{20}:2^{30}=\left(2^2\right)^{20}:2^{30}=2^{40}:2^{30}=2^{10}\)

d) \(28^n:2^n=28^n:4^n=7^n\)

e) \(64^5.16^6:4^{20}=2^{30}.2^{24}:2^{10}=2^{54}:2^{40}=2^{14}\)

f)  \(32^4:8^6=2^{20}:2^{18}=2^2\)

\(a.125^7:25^4=5^{21}:5^8=5^{13}\)

\(b.27^8:9^5=3^{24}:3^{10}=3^{14}\)

\(c.4^{20}:2^{30}=2^{40}:2^{30}=2^{10}\)

\(d.28^n:2^{2n}=28^n:4^n=7n\)

\(\hept{\begin{cases}e.64^5.16^6:4^{20}=4^{15}.4^{12}:4^{20}=4^7\\f.32^4:8^6=2^{20}:2^{18}=2^2\end{cases}}\)

x=(0,1,2,3,...,9)

y=(0,5)

Bn tự lắp số vào nha

n.(n+1).(n+5)

=n.((n+1).(n+5))

=n.n(1+5)

=n.n.6

=> C chia hết cho 3

Áp đụng tính chất a chia hết cho b =>a nhân với mọi số đều chia hết cho 3

\(2^3+2^5=8+32=40\)

\(\Rightarrow\)\(\orbr{\begin{cases}m=3,n=5\\m=5,n=3\end{cases}}\)

\(4-\left(\frac{1}{2}x+\frac{3}{4}\right)=-1,5\)

\(\frac{1}{2}x+\frac{3}{4}=\frac{11}{2}\)

\(\frac{1}{2}x=\frac{19}{4}\)

\(x=\frac{19}{2}\)

Vậy \(x=\frac{19}{2}\)

#Học tốt!

\(\frac{1}{2}\)\(x+\frac{3}{4}\)\(=4--1,5=4+1,5=5,5\)

\(\frac{1}{2}\)\(x\)\(=5,5-\frac{3}{4}\)

\(\frac{1}{2}\)\(x\)\(=\frac{11}{2}\)\(-\frac{3}{4}\)\(=\frac{22}{4}\)\(-\frac{3}{4}\)\(=\frac{19}{4}\)

\(x=\frac{19}{4}\)\(:\frac{1}{2}\)\(=\frac{19}{4}\)\(x2\)\(=\frac{38}{4}\)\(=\frac{19}{2}\)

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