4/5 + 3/4 =?

2008-07-09 4:26 pm

回答 (9)

2008-07-09 4:31 pm
✔ 最佳答案
first get a common number on the bottom of 20 by multiplying the first fraction by 4/4 and the second fraction by 5/5:

(4/5)x(4/4) + (3/4)x(5/5) this gives

(4x4)/(5x4) + (3x5)/(4x5) which is

16/20 + 15/20

now just add the numbers in the tops of the fractions and leave the bottom the same

(16+15)/20

31/20 now this is just (20+11)/20 = 20/20 + 11/20 =

1 and 11/20
2016-11-11 10:53 am
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2008-07-12 7:59 pm
16/20 + 15/20
31/20
1 11/20
2008-07-09 9:05 pm
16/20 + 15/20 = 31/20 = 1 11/20.
2008-07-09 4:31 pm
4/5= 16/20
3/4 = 15/20

16/20 + 15/20 = 31/20 = 1 11/20
2008-07-09 4:31 pm
1 and 11/20? i'm not a 100 percent sure, but i think that's it
2008-07-09 4:31 pm
4/5 + 3/4 = ?
16/20 + 15/20 = 31/20 = 1 11/20
參考: School, my brain, books
2008-07-09 4:30 pm
Change to twentieths:

16/20 + 15/20 = 31/20 or 1 and 11/20
2008-07-09 4:30 pm
4/5 + 3/4
= (4/4)(4/5) + (5/5)(3/4)
= 16/20 + 15/20
= 31/20
= 1 11/20


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