Solve 2x/5 -x/4=3. Solve for X?

2009-11-05 2:01 pm

回答 (10)

2009-11-05 11:03 pm
✔ 最佳答案
2x/5-x/4=3
multiply by 20
8x-5x=60
simplify
3x=60
divide by 3
x=20
Check
2(20)/5-20/4=3 ??
8-5=3??
3=3 =)

Final answer:
x=20
2016-12-02 2:21 pm
*** 8(x-4) = 3(2x-5)*** Use the distributive belongings to get 8x -32 = 6x-15 Subtract 6x from the two facets. You get 2x - 32 = -15 upload 32 to the two facets. You get 2x = 17 Divide the two facets via 2 with a view to isolate x. You get x = 17/2 ; or x = 8.5 you may examine the respond via plugging in 8.5 into the unique equation You get 8(8.5-4) = 36 and 3(17-5) = 36
2009-11-06 7:05 pm
8x - 5x = 60

3x = 60

x = 20
2009-11-06 1:22 pm
2x/5 - x/4
now multiplying the first part with 4 and 2nd part with
for common denominator
8x/20 - 5x/20
8x-5x/20
3x/20 =3
3x/3=20

now 3 will be cancelled
x=20
2009-11-05 4:04 pm
x=20
2009-11-05 2:29 pm
2x/5 - x/4 = 3
20(2x/5 - x/4) = 20(3)
4(2x) - 5(x) = 60
8x - 5x = 60
3x = 60
x = 60/3
x = 20
2009-11-05 2:14 pm
2x/5 - x/4= 3
(8x - 5x) / 20 = 3
8x - 5x = 60
3x= 60
x = 60/3
x= 20
參考: my brain
2009-11-05 2:07 pm
Answer is 20
HOW
2x/5 -X/4 =3 gives you
8x - 5x / 20 =3 this gives you
3x/20 = 3
3s get cancelled and you get 20
2009-11-05 2:14 pm
Find common denominator

8X/20 - 5X/20 = 3

3X/20 = 3

3X = 60

X=60/3 ====
參考: 8th grade math
2009-11-05 2:09 pm
x=20.......


收錄日期: 2021-05-01 12:51:22
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20091105060151AAaYD8I

檢視 Wayback Machine 備份