Giá trị của biểu thức M = (4/9 - 7/11) - 4/9 - 3/11
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\(96-4:\left[\left(11-9\right)^5:\left(7-5\right)^3\right]\)
\(96-4:\left[2^5:2^3\right]=96-4:\left[2^2\right]=96-4:4=96-1=95\)
96 - 4: [ (11 - 9)5 : ( 7 - 5)3 ]
96 - 4 : [ 25 : 23 ]
96 - 4: 22
= 96 - 4: 4
= 96 - 1
= 95
\(\dfrac{45}{63}+\dfrac{28}{63}-\dfrac{24}{63}=\dfrac{49}{63}=\dfrac{7}{9}\)
\(\dfrac{31}{32}+\dfrac{11}{16}=\dfrac{31}{32}+\dfrac{22}{32}=\dfrac{43}{32}\)
\(\dfrac{5}{6}\times\dfrac{4}{3}-\dfrac{7}{9}=\dfrac{10}{9}-\dfrac{7}{9}=\dfrac{3}{9}=\dfrac{1}{3}\)
`(6/11 +5/11) xx 3/7`
`= 11/11xx 3/7`
`=1xx3/7`
`=3/7`
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`3/5 xx 7/9 - 3/5 xx 2/9`
`= 3/5 xx (7/9-2/9)`
`= 3/5 xx 5/9`
`= 15/45`
`= 1/3`
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`(6/7 -4/7):2/5`
`= 2/7 : 2/5`
`= 2/7 xx 5/2`
`= 10/14`
`= 5/7`
\(\left(\dfrac{6}{11}+\dfrac{5}{11}\right)\times\dfrac{3}{7}\)
\(=\dfrac{11}{11}\times\dfrac{3}{7}\\ =1\times\dfrac{3}{7}=\dfrac{3}{7}\)
_____
\(\dfrac{3}{5}\times\dfrac{7}{9}-\dfrac{3}{5}\times\dfrac{2}{9}\\ =\dfrac{3}{5}\times\left(\dfrac{7}{9}-\dfrac{2}{9}\right)\\ =\dfrac{3}{5}\times\dfrac{5}{9}\\ =\dfrac{3}{9}\\ =\dfrac{1}{3}\)
_________
\(\left(\dfrac{6}{7}-\dfrac{4}{7}\right):\dfrac{2}{5}\\ =\dfrac{2}{7}\times\dfrac{5}{2}\\ =\dfrac{10}{14}\\ =\dfrac{5}{7}\)
-10/11
\(M=\left(\dfrac{4}{9}-\dfrac{7}{11}\right)-\dfrac{4}{9}-\dfrac{3}{11}\)
\(=\dfrac{4}{9}-\dfrac{7}{11}-\dfrac{4}{9}-\dfrac{3}{11}\)
\(=\left(\dfrac{4}{9}-\dfrac{4}{9}\right)-\left(\dfrac{7}{11}+\dfrac{3}{11}\right)\)
\(=0-\dfrac{10}{11}=-\dfrac{10}{11}\)