( 17/10+7-8,7) : (23/4 -11/2+ 9/25)x(12,98x0,25)+12,5 = ?
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(17/10 + 7 - 8,7) : (23/4 - 11/2 + 9/25) x (12,98 x 0,25) + 12,5
= (1,7 + 7 - 8,7) : (23/4 - 11/2 + 9/25) x (12,98 x 0,25) + 12,5
= (8,7 - 8,7) : (23/4 - 11/2 + 9/25) x (12,98 x 0,25) + 12,5
= 0 : (23/4 - 11/2 + 9/25) x (12,98 x 0,25) + 12,5
= 0 + 12,5
= 12,5
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a: \(=\left(\dfrac{17}{10}+\dfrac{70}{10}-\dfrac{87}{10}\right):\left(\dfrac{23}{4}-\dfrac{11}{4}+\dfrac{9}{25}\right)\cdot\left(12,98\cdot0,25\right)+12,5\)
\(=0:\left(3+\dfrac{9}{25}\right)\cdot\left(12,98+0,25\right)+12,5\)
=12,5
b: \(=\dfrac{13}{12}\cdot\dfrac{27}{5}\cdot2\cdot\dfrac{34}{9}\cdot2\cdot\dfrac{2}{17}\)
\(=\dfrac{13}{12}\cdot2\cdot\dfrac{27}{5}\cdot\dfrac{34}{9}\cdot\dfrac{4}{17}\)
\(=\dfrac{13}{6}\cdot\dfrac{27}{5}\cdot\dfrac{8}{9}=\dfrac{8}{6}\cdot3\cdot\dfrac{13}{5}=4\cdot\dfrac{13}{5}=\dfrac{52}{5}\)
( 17/10+7-8,7) : (23/4 -11/2+ 9/25)x(12,98x0,25)+12,5
=0: (23/4 -11/2+ 9/25)x(12,98x0,25)+12,5
=0+12,5
=12,5
tich dung cho minh nha
nhanh len rui mk tic dung cho