subtract 7/9-(-13/18)?
回答 (6)
2008-10-17 8:49 am
✔ 最佳答案
14/18 + 13/18 = 27/18 = 3/2 = 1½
2008-10-17 3:51 pm
= 7/9 - (- 13/18)
= 14/18 + 13/18
= 27/18 or 3/2
Answer: 3/2 or 1 1/2
Proof (add back to 7/9):
= 3/2 + (- 13/18)
= 27/18 - 13/18
= 14/18 or 7/9
= 14/18 + 13/18
= 27/18 or 3/2
Answer: 3/2 or 1 1/2
Proof (add back to 7/9):
= 3/2 + (- 13/18)
= 27/18 - 13/18
= 14/18 or 7/9
2008-10-17 6:25 pm
7/9 - (-13/18)
= 7/9 + 13/18
= (7 x 2)/(9 x 2) + 13/18
= 14/18 + 13/18
= (14 + 13)/18
= 27/18
= (27 ÷ 9)/(18 ÷ 9)
= 3/2
= 1 1/2
= 7/9 + 13/18
= (7 x 2)/(9 x 2) + 13/18
= 14/18 + 13/18
= (14 + 13)/18
= 27/18
= (27 ÷ 9)/(18 ÷ 9)
= 3/2
= 1 1/2
2008-10-17 3:56 pm
7/9 + 13/18
14/18 + 13/18
27/18
= 3/2
2008-10-17 3:53 pm
7/9-(-13/18)
= 14/18 - (- 13/18) ----------------------------- (7/9) x (2/2)
= (14+13)/18
= 27/18
= 3/2
= 14/18 - (- 13/18) ----------------------------- (7/9) x (2/2)
= (14+13)/18
= 27/18
= 3/2
2008-10-17 3:42 pm
Find the common denominator: 14/18 - (-13/18) Then subtract. 14/18 - (-13/18) = 27/18 = 3/2
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