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TH1: m+n+p khác 0
\(\frac{m+n-p}{p}=\frac{n+p-m}{m}=\frac{p+m-n}{n}\)
\(\Rightarrow2+\frac{m+n-p}{p}=2+\frac{n+p-m}{m}=2+\frac{p+m-n}{n}\)
\(\Rightarrow\frac{m+n+p}{p}=\frac{n+p+m}{m}=\frac{p+m+n}{n}\)
\(\Rightarrow p=m=n\)
thay m=n=p vào biểu thức H ta có:
\(H=\left(1+\frac{m}{m}\right).\left(1+\frac{n}{n}\right).\left(1+\frac{p}{p}\right)\)
\(H=2.2.2=2^3=8\)
TH2: m+n+p = 0 (m,n,p khác 0)
=> m=-(n+p)
=> n=-(m+p)
=>p=-(n+m)
thay m=-(n+p), n=-(m+p), p=-(n+m) vào biểu thức H
\(H=\left(1+\frac{-m-p}{m}\right).\left(1+\frac{-n-m}{n}\right).\left(1+\frac{-n-p}{p}\right)\)
\(H=\left(-\frac{p}{m}\right).\left(-\frac{m}{n}\right).\left(\frac{-n}{p}\right)=-1\)
(1/2)^m = 1/32
mà 1/32 = (1/2)^5 nên m = 5
343/125= (7/5)^n
mà 343/125 = (7/5)^3 nên n=3
a) \(\left(\frac{1}{2}\right)^m=\frac{1}{32}\)
\(=>\left(\frac{1}{2}\right)^m=\frac{1^5}{2^5}\)
\(=>\left(\frac{1}{2}\right)^m=\left(\frac{1}{2}\right)^5\)
\(=>m=5\)
b) \(\frac{343}{125}=\left(\frac{7}{5}\right)^n\)
\(=>\frac{7^3}{5^3}=\left(\frac{7}{5}\right)^n\)
\(=>\left(\frac{7}{5}\right)^3=\left(\frac{7}{5}\right)^n\)
\(=>n=3\)
a) \(\left(\frac{1}{2}\right)^m=\frac{1}{32}\)
\(\Rightarrow\left(\frac{1}{2}\right)^m=\left(\frac{1}{2}\right)^5\)
=> m =5
b) \(\frac{343}{125}=\left(\frac{7}{5}\right)^n\)
\(\Rightarrow\left(\frac{7}{5}\right)^3=\left(\frac{7}{5}\right)^n\)
=> n = 3
Khó quá bạn ơi