`5/2 -3(1/3-x)=1/4-7x`

`=> 5/2 - 1 + 3x=1/4 -7x`

`=>3x+7x= 1/4 - 5/2 +1`

`=> 10x= 1/4 - 10/4 +4/4`

`=>10x= -5/4`

`=>x=-5/4 :10`

`=>x=-5/4 xx1/10`

`=>x= -5/40=-1/8`

=>5/2-3+3x=1/4-7x

=>10x=1/4-5/2+3=3/4

=>x=3/40

5(x-1)=125-25

5(x-1)=100

x-1=100:5

x-1=20

x=20+1

x=21

12(x-1):3=64+8

12(x-1):3=72

12(x-1)=72.3

12(x-1)=216

x-1=216:12

x-1=18

x=18+1

x=19

(x-1)^3=5^3

=>x-1=5

x=5+1

x=6

=1/2×2/3×3/4×4/5+4/3÷5/3

=1/3×3/5+4/5

=1/5+4/5

=5/5=1

bằng\(\frac{23}{25}\)

=\(\left(1-\frac{1}{2}\right)x\left(1-\frac{1}{3}\right)x\left(1-\frac{1}{4}\right)x\left(1-\frac{1}{5}\right)+\frac{4}{3}:\frac{5}{3}\)

=\(\frac{2-1}{2}x\frac{3-1}{3}x\frac{4-1}{4}x\frac{5-1}{5}+\frac{4}{5}\)

=\(\frac{1}{2}x\frac{2}{3}x\frac{3}{4}x\frac{4}{5}+\frac{4}{5}\)

=\(\frac{1}{5}+\frac{4}{5}\)

=1

`Answer:`

`(2/3+x)-(-1/2)=3/5`

`<=>2/3+x=3/5-1/2`

`<=>2/3+x=\frac{1}{10}`

`<=>x=\frac{1}{10}-2/3`

`<=>x=\frac{-17}{30}`

`-3/4-(x-7/2)=1/2+(-2/3)`

`<=>-3/4-(x-7/2)=-1/6`

`<=>x-7/2=-3/4-(-1/6)`

`<=>x-7/2=-3/4+1/6`

`<=>x-7/2=-\frac{7}{12}`

`<=>x=\frac{-7}{12}+7/2`

`<=>x=\frac{35}{12}`

khó quá bẹn gì đấy ơi

719

vào câu hỏi tương tự tham khảo cách làm

a, 23/4 : 3 + 9/4 x 1/3 - 3/8

=  7,8 + 12,22 - 3,8

= 20,02 - 3,8

  =16,22

b, 3/5 : 5/6 : 6/7 : 7/8 + 2/5 +23/35 

=3/5 x 6/5 x 7/6 x 8/7 + 2/5 + 23/35

a, 23/4 : 3 + 9/4 x 1/3 - 3/8= 7,8 + 12,22 - 3,8= 20,02 - 3,8 =16,22b, 3/5 : 5/6 : 6/7 : 7/8 + 2/5 +23/35 =3/5 x 6/5 x 7/6 x 8/7 + 2/5 + 23/35=24/25 + 2/5 + 23/35=1/5 x(24/5 + 2 +23/7)=1/5 x 353/35=353/175