5.(-1+3)-4(3+1)
=-5+15-12-4
=-6

5.(-1+3)-4.(3+1)

=5.2-4.4

=10-16

=-6

5.(-1+3)-4.(3+1)

=5.2-4.4

=10-16

=-6

5.(-1)+3-4.3+1=(-5)+3-12+1=(-2)-12+1=-13

Vậy kết quả là -13

2-(3+2-4)-3.(-5+6)

=2-3-2+4-3.(-5+6)

=1-3.1

=-2

Ta sẽ dùng quy tắc đổi dấu :

 -( 3/5 + 3/4 ) - ( -3/4 + 2/5 )

= -3/5 - 3/4 + 3/4 - 2/5

= -3/5 - ( -2/5 )

=  -1/5

-3/5-3/4+3/4-2/5

=(-3/4+3/4)-3/5+2/5

=0-3/5+2/5

=1/5

nhớ tk nhe mn

`(1/4 + -5/13 ) + ( 2/11 +( -8/13) + 3/4 )`

`= 1/4 + -5/13 + 2/11 +( -8/13) + 3/4`

`=(1/4+3/4) + ( (-5)/13 + (-8)/13) + 2/11`

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

`=0+2/11`

`=2/11`

`(1/4+(-5)/13)+(2/11+(-8)/13+3/4)`

`=1/4+(-5)/13+2/11+(-8)/13+3/4`

`=(1/4+3/4)+( (-5)/13 + (-8)/13 ) + 2/11`

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

`= 0+2/11`

`=2/11`

`(1/4 + -5/13 ) + ( 2/11 + -8/13 + 3/4 )`

`=1/4  -5/13  + 2/11  -8/13 + 3/4`

`=(1/4 +3/4) + 2/11 + (-5/13 -8/13)`

`= 1 +2/11 -1`

`=2/11`

a: =-48+27+56-48-27-36

=-96+20

=-76

b: =23-57+57-33=-10

c: =-98+12-159-12-41

=-98-200

=-298

\(1,\left[\left(-\dfrac{2}{5}\right)+\dfrac{1}{3}\right]-\left(\dfrac{3}{5}-\dfrac{1}{3}\right)=-\dfrac{2}{5}+\dfrac{1}{3}-\dfrac{3}{5}+\dfrac{1}{3}\\ =\left(-\dfrac{2}{5}-\dfrac{3}{5}\right)+\left(\dfrac{1}{3}+\dfrac{1}{3}\right)\\ =\dfrac{-2-3}{5}+\dfrac{1+1}{3}\\ =-\dfrac{5}{5}+\dfrac{2}{3}\\ =-1+\dfrac{2}{3}\\ =\dfrac{-3+2}{3}=-\dfrac{1}{3}\\ b,\left(\dfrac{3}{2}-\dfrac{3}{4}\right)-\left(0,25+\dfrac{1}{2}\right)\\ =\left(\dfrac{3}{2}-\dfrac{3}{4}\right)-\left(\dfrac{1}{4}+\dfrac{1}{2}\right)\\ =\dfrac{3}{2}-\dfrac{3}{4}-\dfrac{1}{4}-\dfrac{1}{2}\\ =\left(\dfrac{3}{2}-\dfrac{1}{2}\right)+\left(-\dfrac{3}{4}-\dfrac{1}{4}\right)\\ =\dfrac{3-1}{2}+\dfrac{-3-1}{4}\\ =\dfrac{2}{2}-\dfrac{4}{4}=1-1=0\)

1: =-2/5+1/3-3/5+1/3

=-1+2/3=-1/3

2: =3/2-3/4-1/4-1/2

=1-1=0

Mình đã trả lời tại link này: https://olm.vn/hoi-dap/question/180855.html?pos=3148734. Bạn tham khảo nha

mình ko hiểu