c今年40歲,剛好isD歲數的2倍少8歲。D今年幾歲?
(用方程式)
c今年40歲,剛好isD歲數的2倍少8歲。D今年幾歲?
2007-05-06 10:33 pm
回答 (9)
2007-05-06 10:46 pm
✔ 最佳答案
D=24D的2倍=48
D的2倍少8歲=48-8
c=40
所以D=24
2007-05-07 2:12 am
Let y be the age of D.
40=2y-8
48=2y
y=48/2
y=24
Therefore, D is 24 years old.
40=2y-8
48=2y
y=48/2
y=24
Therefore, D is 24 years old.
2007-05-06 11:33 pm
REFERS TO THE QUESTION : C = 40 = 2D - 8
40 = 2D - 8
48 = 2D
24 = D
所以 D IS 24 歲
40 = 2D - 8
48 = 2D
24 = D
所以 D IS 24 歲
2007-05-06 11:31 pm
設D現在x歲。
2x-8=40
2x=40+8
2x=48
x=48/2
x=24
所以D現在24歲。
2x-8=40
2x=40+8
2x=48
x=48/2
x=24
所以D現在24歲。
2007-05-06 10:58 pm
2D-8=40
2D-8+8=40+8
2D/2=48/2
D=24
2D-8+8=40+8
2D/2=48/2
D=24
2007-05-06 10:41 pm
c今年40歲,剛好isD歲數的2倍少8歲。D今年幾歲?
2x-8=40
2x=48
x=24
.'.D今年24歲
2x-8=40
2x=48
x=24
.'.D今年24歲
參考: Thank you
2007-05-06 10:40 pm
啦，c今年40歲 C=40 (1)
這樣c is d 2倍少8歲 C=2D-8 (2)
將(2) 入 (1) 40=2D-8
48=2D
D=24歲
這樣c is d 2倍少8歲 C=2D-8 (2)
將(2) 入 (1) 40=2D-8
48=2D
D=24歲
2007-05-06 10:39 pm
因為C = 40
C = 2D - 8
40 = 2D - 8
2D = 48
D = 24
D今年24歲
C = 2D - 8
40 = 2D - 8
2D = 48
D = 24
D今年24歲
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