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39\(\times\)25 + 87\(\times\)61 + 62
= 975 + 5307 + 62
= 6282 + 62
= 6344
\(-\dfrac{3}{17}+\left(\dfrac{2}{3}+\dfrac{3}{17}\right)=\dfrac{-3}{17}+\dfrac{3}{17}+\dfrac{2}{3}=\dfrac{2}{3}\)
\(\dfrac{-5}{21}+\dfrac{-16}{21}+1=-1+1=0\)
\(\dfrac{-4}{11}\cdot\dfrac{5}{15}\cdot\dfrac{11}{-4}=\dfrac{5}{15}=\dfrac{1}{3}\)
A= 3/11*16+3/16*21+3/21*26+.....+3/61*66
\(=\frac{3}{5}\left(\frac{5}{11.16}+\frac{5}{16.21}+...+\frac{5}{61.66}\right)\)
\(=\frac{3}{5}\left(\frac{1}{11}-\frac{1}{16}+\frac{1}{16}-\frac{1}{21}+...+\frac{1}{61}-\frac{1}{66}\right)\)
\(=\frac{3}{5}\left(\frac{1}{11}-\frac{1}{66}\right)\)
\(=\frac{3}{5}\cdot\frac{5}{66}\)
\(=\frac{1}{22}\)
\(A=\frac{3}{11.16}+\frac{3}{16.21}+\frac{3}{21.26}+...+\frac{3}{61.66}\)
\(\Rightarrow A=\frac{3}{5}\left(\frac{5}{11.16}+\frac{5}{16.21}+\frac{5}{21.26}+...+\frac{5}{61.66}\right)\)
\(\Rightarrow A=\frac{3}{5}.\left(\frac{1}{11}-\frac{1}{16}+\frac{1}{16}-\frac{1}{21}+\frac{1}{21}-\frac{1}{26}+...+\frac{1}{61}-\frac{1}{66}\right)\)
\(\Rightarrow A=\frac{3}{5}.\left(\frac{1}{11}-\frac{1}{66}\right)\)
\(\Rightarrow A=\frac{3}{5}.\frac{5}{66}\)
\(\Rightarrow A=\frac{1}{22}\)
Vậy \(A=\frac{1}{22}\)
\(\frac{5}{11}+3\frac{8}{21}+\frac{6}{11}-\frac{8}{21}\)
\(=\frac{5}{11}+\frac{71}{21}+\frac{6}{11}-\frac{8}{21}\)
\(=\left(\frac{5}{11}+\frac{6}{11}\right)+\left(\frac{71}{21}-\frac{8}{21}\right)\)
\(=1+3\)
\(=4\)
Đúng lun, Mn tk mk nha!
\(\frac{5}{11}+3\frac{8}{21}+\frac{6}{11}-\frac{8}{21}\)
=\(\frac{5}{11}+\frac{71}{21}+\frac{6}{11}-\frac{8}{21}\)
=\(\left(\frac{5}{11}+\frac{6}{11}\right)+\left(\frac{71}{21}-\frac{8}{21}\right)\)
=\(1+3\)
=
\(=\dfrac{3^{10}.3.11+\left(-1\right).3^{11}.\left(-1\right).3.7}{3^9.2^5}\\ =\dfrac{3^{11}.11+3^{12}.7}{3^9.2^5}\\ =\dfrac{3^9\left(3^2.11+3^3.7\right)}{3^9.2^5}\\ =\dfrac{9.11+27.7}{2^5}\\ =\dfrac{99+189}{32}\\ =\dfrac{288}{32}=9\)
A = \(\dfrac{3^{10}.33+\left(-3\right)^{11}.\left(-21\right)}{3^9.2^5}\)
A = \(\dfrac{3^{10}.3.11-3^{11}.\left(-21\right)}{3^9.2^5}\)
A = \(\dfrac{3^{11}.11+3^{11}.21}{3^9.2^5}\)
A = \(\dfrac{3^{11}.\left(11+21\right)}{3^9.2^5}\)
A = \(\dfrac{3^{11}.32}{3^9.32}\)
A = 32
A = 9