mk nè !!!!!!!!!!!

bn dừng có gửi linh tinh trên old

a) \(\frac{13}{26}-\frac{1}{3}-\frac{1}{2}+\frac{7}{21}\)
\(=\frac{1}{2}-\frac{1}{3}-\frac{1}{2}+\frac{1}{3}\)
\(=\frac{1}{2}-\frac{1}{2}+\frac{1}{3}-\frac{1}{3}\)
\(=0+0\)
\(=0\)

b) \(\left(\frac{-5}{12}+\frac{6}{11}\right)+\left(\frac{7}{17}+\frac{5}{17}+\frac{5}{12}\right)\)
\(=\frac{-5}{12}+\frac{6}{11}+\frac{7}{17}+\frac{5}{17}+\frac{5}{12}\)
\(=\left(\frac{-5}{12}+\frac{5}{12}\right)+\left(\frac{7}{17}+\frac{5}{17}\right)+\frac{6}{11}\)
\(=0+\frac{12}{17}+\frac{6}{11}\)
\(=\frac{132}{187}+\frac{102}{187}\)
\(=\frac{234}{187}\)

c) \(\left(\frac{13}{5}+\frac{7}{16}\right)-\left(\frac{11}{16}-\frac{12}{10}\right)\)
\(=\left(\frac{13}{5}+\frac{7}{16}\right)-\left(\frac{11}{16}-\frac{6}{5}\right)\)
\(=\frac{13}{5}+\frac{7}{16}-\frac{11}{16}+\frac{6}{5}\)
\(=\left(\frac{13}{5}+\frac{6}{5}\right)+\left(\frac{7}{16}-\frac{11}{16}\right)\)
\(=\frac{19}{5}+\left(\frac{-4}{16}\right)\)
\(=\frac{19}{5}-\frac{1}{4}\)
\(=\frac{76}{20}-\frac{5}{20}\)
\(=\frac{71}{20}\)

d) \(-\left(\frac{3}{10}-\frac{6}{11}\right)-\left(\frac{21}{30}-\frac{5}{11}\right)\)
\(=-\left(\frac{3}{10}-\frac{6}{11}\right)-\left(\frac{7}{10}-\frac{5}{11}\right)\)
\(=-\frac{3}{10}+\frac{6}{11}-\frac{7}{10}+\frac{5}{11}\)
\(= \left(-\frac{3}{10}-\frac{7}{10}\right)+\left(\frac{6}{11}+\frac{5}{11}\right)\)
\(=\frac{-10}{10}+\frac{11}{11}\)
\(=-1+1\)
\(=0\)

2700 số

a) \(^{25^2}\).\(5^2\)=\(\left(5^2\right)^2\).5\(^2\)=\(^{5^4}\).\(5^2\)=5\(^6\)

b)9\(^2\).9.27 = 9\(^2\).9.9\(^3\)=9\(^6\)

c)4\(^3\).4.8=\(4^3\).4.4\(^2\)=4\(^6\)

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a) x\(^2\)=7\(^2\)→x = 7

b)x\(^3\)=4\(^3\)→x=4

c)x\(^4\)=2\(^4\)→x=2

d)\(\left(x+1\right)^2\)=5\(^2\)→x+1=5→x=4

e) x \(\in\Phi\)

Bạn không nên đăng câu linh tinh trên online math! 

bn k mik đi rồi mik kb

kb với mình nha

kb voi minh nha

pokemon

Tham khảo nha!: 

\(\frac{125.25^3}{5^9}=\frac{5^3.5^3.5^3}{5^9}\)\(=\frac{5^9}{5^9}=1\)

^^ Học tốt! 

\(=\frac{5^3.5^{2^3}}{5^9}=\frac{5^3.5^6}{5^9}=\frac{5^9}{5^9}=1\)