$1\frac{2}{3}+[0,25:(10,3-9,8)-$ $\frac{3}{4}]$
$(\frac{5}{7}.0,6-5:3$ $\frac{1}{2}).(40phần trăm – 1,4).(-2)$ $^{3}$
$B=\frac{13}{15}.0,25.3+($ $\frac{8}{15}-1$ $\frac{19}{60}):1$ $\frac{23}{24}$
$1\frac{2}{3}+[0,25:(10,3-9,8)-$ $\frac{3}{4}]$
$(\frac{5}{7}.0,6-5:3$ $\frac{1}{2}).(40phần trăm – 1,4).(-2)$ $^{3}$
$B=\frac{13}{15}.0,25.3+($ $\frac{8}{15}-1$ $\frac{19}{60}):1$ $\frac{23}{24}$
`a)1 2/3+[0,25: ( 10 , 3 − 9 , 8 ) − 3 /4 ] `
`=5/3+[0,25: 0,5 − 3 /4 ].`
`=5/3+[1/2 − 3 /4 ]`
`=5/3-1/2`
`=7/6`
`b)( 5 /7 .0 , 6 − 5 : 3 1 /2 ) . ( 40 % − 1 , 4 ) . ( − 2 )^ 3 `
`=( 5 /7 .0 , 6 − 5 : 7 /2 ) . ( 2/5 − 7/5 ) . ( − 8 ) `
`= ( 3/7 − 10/7 ) . (-1) . ( − 8 ) `
`=-1 . ( − 8 ) `
`=-8`
`c)B = 13 15 .0 , 25.3 + ( 8 15 − 1 19 60 ) : 1 23 24`
`B = 13/ 20 + ( 8 /15 − 79 /60 ) : 47 /24`
`B = 13/ 20 -47 /60 xx 24/47`
`B = 13/ 20 -8/20`
`B=1/4`
`\color{red}{\text{IQ vô cực}}`
$1\dfrac{2}{3}+[0,25:(10,3-9,8)-\dfrac{3}{4}]$
$=\dfrac{5}{3}+[\dfrac{1}{4}:0,5-\dfrac{3}{4}]$
$=\dfrac{5}{3}+\dfrac{1}{4}:\dfrac{1}{2}-\dfrac{3}{4}$
$=\dfrac{5}{3}+\dfrac{1}{2}-\dfrac{3}{4}$
$=\dfrac{17}{12}$
$(\dfrac{5}{7}.0,6-5:3\dfrac{1}{2}).(40\%-1,4).(-2)^3$
$=(\dfrac{5}{7}.\dfrac{3}{5}-5:\dfrac{7}{2}).(\dfrac{40}{100}-\dfrac{7}{5}).(-8)$
$=(\dfrac{3}{7}-5.\dfrac{2}{7}).(\dfrac{2}{5}-\dfrac{7}{5}).(-8)$
$=(\dfrac{3}{7}-\dfrac{10}{7}).(-1).(-8)$
$=(-1).(-1).(-8)$
$=-8$
$B=\dfrac{13}{15}.0,25.3+(\dfrac{8}{15}-1\dfrac{19}{60}):1\dfrac{23}{24}$
$B=\dfrac{13}{15}.\dfrac{1}{4}.3+(\dfrac{8}{15}-\dfrac{79}{60}):\dfrac{47}{24}$
$B=\dfrac{13.1.3}{15.4}+\dfrac{-47}{60}.\dfrac{24}{47}$
$B=\dfrac{13}{20}+\dfrac{-2}{5}$
$B=\dfrac{1}{4}$