`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, 12 - 11 + 15 + 37 + 11

= 12 + 15 + 37 - 11 + 11

= 12 + 15 + 37

= 27 + 37 = 64

b, 100 : { 31 - [ 24 : ( 18 - 7.2 )]}

= 100 : { 31 - [ 24 : ( 18 - 14 )]}

= 100 : [ 31 - ( 24 : 4 )]

= 100 : ( 31 - 6 ) 

= 100 : 25 = 4

a)

  12 - 11 + 15 + 37 + 11

   = 12 + 15 + 37 - 11 + 11

    = 12 + 15 + 37

    = 27 + 37 

    = 64

 b)  

100 : { 31 - [ 24 : ( 18 - 7 x 2 ) ]}

= 100 : { 31 - [ 24 : ( 18 - 14] )

= 100 : { 31- [ 24 : 4 ] }

= 100 : { 31 - 6 }

= 100 : 25

= 4

giúp mình với

41/16

41/16

a) \(=\left(\left(-\frac{1}{4}-\frac{5}{3}\right)+\frac{7}{33}\right)-\left(-\frac{15}{12}+\frac{6}{11}-\frac{48}{49}\right)\)

\(=\left(-\frac{23}{12}+\frac{7}{33}\right)+\frac{15}{12}-\frac{6}{11}+\frac{48}{49}\)

\(=\left(-\frac{23}{12}+\frac{15}{12}\right)+\left(\frac{9}{33}-\frac{6}{11}\right)+\frac{48}{49}\)

\(=-\frac{2}{3}-\frac{3}{11}+\frac{48}{49}\)

\(=\frac{65}{1617}\)

b) \(=\frac{11}{125}+\left(-\frac{17}{18}+\frac{4}{9}\right)+\left(-\frac{5}{7}+\frac{17}{14}\right)\)

\(=\frac{11}{125}-\frac{1}{2}+\frac{1}{2}\)

\(=\frac{11}{125}\)

tính từng cái là đc

cau a em

4:

a: =4/15-2,9+11/15=1-2,9=-1,9

b: \(=-36,75+3,7-63,25+6,3=10-100=-90\)

c: \(=6,5+3,5-\dfrac{10}{17}-\dfrac{7}{17}=10-1=9\)

d: \(=\dfrac{13}{25}\left(-39,1-60,9\right)=\dfrac{13}{25}\left(-100\right)=-52\)

e: =-5/12-7/12-3,7-6,3=-1-10=-11

f: =2,8(-6/13-7/13)-7,2=-2,8-7,2=-10

cậu tách ra từng bài thôi nha.

`@` `\text {Ans}`

`\downarrow`

`a.`

`A=(1/2-7/13-1/3)+(-6/13+1/2+1 1/3)`

`= 1/2 - 7/13 - 1/3 - 6/13 + 1/2 + 1 1/3`

`= (1/2 + 1/2) + (-7/13 - 6/13) + (-1/3 + 1 1/3) `

`= 1 - 1 + 1`

`= 1`

`b.`

`B=0,75+2/5+(1/9-1 1/2+5/4)`

`= 3/4 + 2/5 + 1/9 - 3/2 + 5/4`

`= (3/4+5/4)+ 1/9 + 2/5 - 3/2`

`= 2 + 1/9 - 11/10`

`= 19/9 - 11/10`

`= 91/90`

`c.`

`(-5/9).3/11+(-13/18).3/11`

`= 3/11*[(-5/9) + (-13/18)]`

`= 3/11*(-23/18)`

`= -23/66`

`d.`

`(-2/3).3/11+(-16/9).3/11`

`= 3/11* [(-2/3) + (-16/9)]`

`= 3/11*(-22/9)`

`= -2/3`

`e.`

`(-1/4).(-2/13)-7/24.(-2/13)`

`= (-2/13)*(-1/4-7/24)`

`= (-2/13)*(-13/24)`

`= 1/12`

`f.`

`(-1/27).3/7+(5/9).(-3/7)`

`= 3/7*(-1/27 - 5/9)`

`= 3/7*(-16/27)`

`= -16/63`

`g.`

`(-1/5+3/7):2/11+(-4/5+4/7):2/11`

`=[(-1/5+3/7)+(-4/5+4/7)] \div 2/11`

`= (-1/5+3/7 - 4/5 + 4/7) \div 2/11`

`= [(-1/5-4/5)+(3/7+4/7)] \div 2/11`

`= (-1+1) \div 2/11`

`= 0 \div 2/11 = 0`

Giúp tớ với tớ cần gấp

a: \(=\dfrac{-5}{7}-\dfrac{2}{7}+\dfrac{3}{4}+\dfrac{1}{4}-\dfrac{1}{5}=-\dfrac{1}{5}\)

b: \(=\dfrac{-3}{31}-\dfrac{28}{31}+\dfrac{-6}{17}-\dfrac{11}{17}+\dfrac{1}{29}-\dfrac{1}{5}=\dfrac{-24}{145}\)

Ta có : \(\frac{-5}{9}.\frac{3}{11}+\frac{-13}{18}.\frac{3}{11}\)

\(=\frac{3}{11}.\left(\frac{-5}{9}+\frac{-13}{18}\right)\)

\(=\frac{3}{11}.\frac{-23}{18}\)

\(=\frac{-23}{66}\)

Em xem bài bày rất đơn giản :))

thấy đều có 3/11 là giống nhau đúng ko:)

Em đưa nó ra ngoài mình áp dụng cái tính chất : a.b+c.b=(a+c).b

\(\left(-\frac{5}{9}+\frac{-13}{18}\right).\frac{3}{11}=\)

Cái này chắc em tự làm đc:))

\(\frac{-5}{9}.\frac{3}{11}+\frac{-13}{18}.\frac{3}{11}\)=\(\frac{3}{11}.\left(\frac{-5}{9}+\frac{-13}{18}\right)\)=\(\frac{3}{11}.\left(\frac{-10}{18}+\frac{-13}{18}\right)\)=\(\frac{3}{11}.\frac{-23}{18}\)=\(\frac{-23}{66}\)