Phí Anh Quốc
Giới thiệu về bản thân
A=\(3 \left(\right. \frac{3}{20.23} + \frac{3}{23.26} + \frac{3}{26.29} + . . . + \frac{3}{77.80} \left.\right)\)
A\(= 3 \left(\right. \frac{1}{20} - \frac{1}{23} + \frac{1}{23} - \frac{1}{26} + \frac{1}{26} - \frac{1}{29} + . . . + \frac{1}{77} - \frac{1}{80} \left.\right)\)
\(A = 3 \left(\right. \frac{1}{20} - \frac{1}{80} \left.\right)\)
A\(= 3 \left(\right. \frac{4}{80} - \frac{1}{80} \left.\right)\)
A\(= 3. \frac{3}{80}\)
A\(= \frac{9}{80}\)
\(\frac{9}{80}<1\)
⇒A\(<1\)
A=\(3 \left(\right. \frac{3}{20.23} + \frac{3}{23.26} + \frac{3}{26.29} + . . . + \frac{3}{77.80} \left.\right)\)
A\(= 3 \left(\right. \frac{1}{20} - \frac{1}{23} + \frac{1}{23} - \frac{1}{26} + \frac{1}{26} - \frac{1}{29} + . . . + \frac{1}{77} - \frac{1}{80} \left.\right)\)
\(A = 3 \left(\right. \frac{1}{20} - \frac{1}{80} \left.\right)\)
A\(= 3 \left(\right. \frac{4}{80} - \frac{1}{80} \left.\right)\)
A\(= 3. \frac{3}{80}\)
A\(= \frac{9}{80}\)
\(\frac{9}{80} < \frac{1}{9}\)
⇒A\(< \frac{1}{9}\)
A=\(3 \left(\right. \frac{3}{20.23} + \frac{3}{23.26} + \frac{3}{26.29} + . . . + \frac{3}{77.80} \left.\right)\)
A\(= 3 \left(\right. \frac{1}{20} - \frac{1}{23} + \frac{1}{23} - \frac{1}{26} + \frac{1}{26} - \frac{1}{29} + . . . + \frac{1}{77} - \frac{1}{80} \left.\right)\)
\(A = 3 \left(\right. \frac{1}{20} - \frac{1}{80} \left.\right)\)
A\(= 3 \left(\right. \frac{4}{80} - \frac{1}{80} \left.\right)\)
A\(= 3. \frac{3}{80}\)
A\(= \frac{9}{80}\)
\(\frac{9}{80} < \frac{1}{9}\)
⇒A\(< \frac{1}{9}\)
A=\(3 \left(\right. \frac{3}{20.23} + \frac{3}{23.26} + \frac{3}{26.29} + . . . + \frac{3}{77.80} \left.\right)\)
A\(= 3 \left(\right. \frac{1}{20} - \frac{1}{23} + \frac{1}{23} - \frac{1}{26} + \frac{1}{26} - \frac{1}{29} + . . . + \frac{1}{77} - \frac{1}{80} \left.\right)\)
\(A = 3 \left(\right. \frac{1}{20} - \frac{1}{80} \left.\right)\)
A\(= 3 \left(\right. \frac{4}{80} - \frac{1}{80} \left.\right)\)
A\(= 3. \frac{3}{80}\)
A\(= \frac{9}{80}\)
\(\frac{9}{80}<\frac19\)
⇒A\(<\frac19\)
A=\(3 \left(\right. \frac{3}{20.23} + \frac{3}{23.26} + \frac{3}{26.29} + . . . + \frac{3}{77.80} \left.\right)\)
A\(= 3 \left(\right. \frac{1}{20} - \frac{1}{23} + \frac{1}{23} - \frac{1}{26} + \frac{1}{26} - \frac{1}{29} + . . . + \frac{1}{77} - \frac{1}{80} \left.\right)\)
\(A = 3 \left(\right. \frac{1}{20} - \frac{1}{80} \left.\right)\)
A\(= 3 \left(\right. \frac{4}{80} - \frac{1}{80} \left.\right)\)
A\(= 3. \frac{3}{80}\)
A\(= \frac{9}{80}\)
\(\frac{9}{80}<\frac18\)
⇒A\(<\frac18\)
A=\(3 \left(\right. \frac{3}{20.23} + \frac{3}{23.26} + \frac{3}{26.29} + . . . + \frac{3}{77.80} \left.\right)\)
A\(= 3 \left(\right. \frac{1}{20} - \frac{1}{23} + \frac{1}{23} - \frac{1}{26} + \frac{1}{26} - \frac{1}{29} + . . . + \frac{1}{77} - \frac{1}{80} \left.\right)\)
\(A = 3 \left(\right. \frac{1}{20} - \frac{1}{80} \left.\right)\)
A\(= 3 \left(\right. \frac{4}{80} - \frac{1}{80} \left.\right)\)
A\(= 3. \frac{3}{80}\)
A\(= \frac{9}{80}\)
\(\frac{9}{80} < 1\)
⇒A<1
A=\(3 \left(\right. \frac{3}{20.23} + \frac{3}{23.26} + \frac{3}{26.29} + . . . + \frac{3}{77.80} \left.\right)\)
A\(= 3 \left(\right. \frac{1}{20} - \frac{1}{23} + \frac{1}{23} - \frac{1}{26} + \frac{1}{26} - \frac{1}{29} + . . . + \frac{1}{77} - \frac{1}{80} \left.\right)\)
\(A = 3 \left(\right. \frac{1}{20} - \frac{1}{80} \left.\right)\)
A\(= 3 \left(\right. \frac{4}{80} - \frac{1}{80} \left.\right)\)
A\(= 3. \frac{3}{80}\)
A\(= \frac{9}{80}\)
\(\frac{9}{80} < 1\)
⇒A<1
A=\(3 \left(\right. \frac{3}{20.23} + \frac{3}{23.26} + \frac{3}{26.29} + . . . + \frac{3}{77.80} \left.\right)\)
A\(= 3 \left(\right. \frac{1}{20} - \frac{1}{23} + \frac{1}{23} - \frac{1}{26} + \frac{1}{26} - \frac{1}{29} + . . . + \frac{1}{77} - \frac{1}{80} \left.\right)\)
\(A = 3 \left(\right. \frac{1}{20} - \frac{1}{80} \left.\right)\)
A\(= 3 \left(\right. \frac{4}{80} - \frac{1}{80} \left.\right)\)
A\(= 3. \frac{3}{80}\)
A\(= \frac{9}{80}\)
\(\frac{9}{80} < 1\)
⇒A<1
bài trước đó sai đấy.
A=\(3 \left(\right. \frac{3}{20.23} + \frac{3}{23.26} + \frac{3}{26.29} + . . . + \frac{3}{77.80} \left.\right)\)
A\(= 3 \left(\right. \frac{1}{20} - \frac{1}{23} + \frac{1}{23} - \frac{1}{26} + \frac{1}{26} - \frac{1}{29} + . . . + \frac{1}{77} - \frac{1}{80} \left.\right)\)
\(A = 3 \left(\right. \frac{1}{20} - \frac{1}{80} \left.\right)\)
A\(= 3 \left(\right. \frac{4}{80} - \frac{1}{80} \left.\right)\)
A\(= 3. \frac{3}{80}\)
A\(= \frac{9}{80}\)
\(\frac{9}{80} < 1\)
⇒A<1
bài trước đó sai đấy.
A=\(3 \left(\right. \frac{3}{20.23} + \frac{3}{23.26} + \frac{3}{26.29} + . . . + \frac{3}{77.80} \left.\right)\)
A\(= 3 \left(\right. \frac{1}{20} - \frac{1}{23} + \frac{1}{23} - \frac{1}{26} + \frac{1}{26} - \frac{1}{29} + . . . + \frac{1}{77} - \frac{1}{80} \left.\right)\)
\(A=3\left(\right.\frac{1}{20}-\frac{1}{80}\left.\right)\)
A\(= 3 \left(\right. \frac{4}{80} - \frac{1}{80} \left.\right)\)
A\(= 3. \frac{3}{80}\)
A\(= \frac{9}{80}\)
\(\frac{9}{80}<1\)
⇒A<1
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