A=1                                                                                                                                                                                                  B=-4

\(\frac{4}{9}\).\(\frac{13}{3}\)-\(\frac{4}{3}\).\(\frac{40}{9}\)

=\(\frac{4}{9}\).\(\frac{13}{3}\)-\(\frac{4}{9}\).\(\frac{40}{3}\)

=\(\frac{4}{9}\).(\(\frac{13}{3}\)-\(\frac{40}{3}\))

=\(\frac{4}{9}\).(-9)

=\(\frac{-36}{9}\)

=-4

`a: =(7/3-4/3)+11/5=16/5`

`b: =(18/13-5/13)+55/46=1+55/46=101/46`

`c: =27/25-4/9-2/25+5/9=(27/25-2/25)+(5/9-4/9)=1+1/9=10/9`

A = \(\dfrac{4}{3}\) + \(\dfrac{17}{3}\) +  \(\dfrac{17}{9}\) + \(\dfrac{19}{13}\) + \(\dfrac{1}{9}\) + \(\dfrac{14}{6}\)

A = (\(\dfrac{4}{3}\) + \(\dfrac{17}{3}\)) + (\(\dfrac{17}{9}\) + \(\dfrac{1}{9}\)) + (\(\dfrac{19}{13}\) + \(\dfrac{14}{6}\))

A = \(\dfrac{21}{3}\) + \(\dfrac{18}{9}\) + \(\dfrac{148}{39}\)

A = 7 + 2 + \(\dfrac{148}{39}\)

A = 9 + \(\dfrac{148}{39}\)

A = \(\dfrac{39\times9}{39}\) + \(\dfrac{148}{39}\)

A = \(\dfrac{499}{39}\)

4/3+17/3+17/9+19/13+1/9+14/6=499/39.

Ngu

1/3.(4/13-9/11)+1/3.(9/13-4/22)

=1/3(4/13-9/11+9/13-2/11)

=1/3(4/13+9/13-9/11-2/11)

=1/3(1-1)

=1/3.0=0

B=4*13/9*3-4/3*40/9

B=4/3*13/9-4/3*40/9

B=4/3*(13/9-40/9)

B=4/3*(-27)/9

B=4*(-3)/9

B=-4

A=6/7 + 1/7.(2/7+5/7)

A=6/7 + 1/7.7/7=6/7+1/7.1

A=6/7+1/7=7/7=1

M=8/3*2/5*3/8*10*19/2

M=(8/3*3/8)*(2/5*10)*19/2

M=1*4*19/2

M=28