9/17 + 9/34 x 2/3
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(-13/31 + -18/31) : 5/17 . 25/34 = -1 . 17/5 . 25/34
= -17/5 . 25/34
= -425/170
= -5/2
\(\frac{7}{9}\cdot\frac{3}{5}=\frac{7\cdot3}{9\cdot5}=\frac{7\cdot1}{3\cdot5}=\frac{7}{15}\)
\(\frac{9}{22}\cdot55=\frac{9}{22}\cdot\frac{55}{1}=\frac{9\cdot55}{22\cdot1}=\frac{9\cdot5}{2\cdot1}=\frac{45}{2}\)
\(\frac{11}{17}:\frac{33}{34}=\frac{11}{17}\cdot\frac{34}{33}=\frac{11\cdot34}{17\cdot33}=\frac{1\cdot2}{1\cdot3}=\frac{2}{3}\)
`15/34+7/21+9/34-1 15/17+2/3`
`=(15/34+9/34)+(7/21+2/3)-32/17`
`=12/17+1-32/17`
`=(12/17-32/17)+1`
`=-20/17+1`
`=-3/17`
B = \(\dfrac{3}{17}\)x \(\dfrac{2}{9}\) - \(\dfrac{2}{9}\) x \(\dfrac{3}{34}\)
B = \(\dfrac{2}{9}\) x \(\left(\dfrac{3}{17}-\dfrac{3}{34}\right)\)
B = \(\dfrac{2}{9}\) x \(\dfrac{3}{34}\)
B = \(\dfrac{1}{51}\)
=> \(\dfrac{1}{B}\) = 51
=(15/34+9/34-15/17)+(1/3+2/3)
=(24/34-15/17)+1
=-3/17+1
=14/17
= 9/17 + 9/34 x 2/3
= 9/17 + 3/17
= 12/17
12/17 đó bạn