「＊～小學代數題～＊」

1.Y(2/1/3 - 1/3/4)= 1.4

Y( 7/3 - 7/4 ) =14/10
Y [ ( 28-21)/12] = 14/10
[7/12] Y x12/7 = 14/10 x 12/7
Y = 12/5

驗算:
若Y = 12/5 則:
12/5 ( 7/3 - 7/4)
=12/5 ( 7/12)
=12/5 x 7/12
= 7/12
= 1.4
=右邊
12/5(2/1/3 - 1/3/4) = 1.4


2.F(1/5 + 30%) = 0.43

F(20/100 + 30/100)=0.43
50/100F = 0.43
0.5F = 0.43
F = 0.86

驗算:
若F=0.86 則:
0.86(1/5 +30%)
=0.86(20/100 + 30/100)
=0.86 x 50/100
=0.86 x 0.5
= 0.43
= 右邊
0.86(1/5 +30%) = 0.43

Y(2/1/3 - 1/3/4)= 1.4

Y(7/3 – 7/4) = 14/10
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Y(28/12 – 21/12) = 14/10
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Y(7/12) = 14/10
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Y = (14/10)(12/7)
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Y = 2/2/5

驗算:
若Y = 2/2/5
左邊:

2/2/5(2/1/3 - 1/3/4)
----------------------------------
=12/5 (7/3-7/4)
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=12/5 (28/12-21/12)
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=(12/5)(7/12)
-----------------------------------
=7/5
-----------------------------------
=1/2/5
-------------------------------
=1.4
=右邊

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F(1/5+30%) = 0.43

F (0.2 + 0.3) = 0.43
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0.5 F = 0.43
-------------------------------------
F = 0.43/0.5
--------------------------------------
F = 0.86
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驗算:
若F = 0.86
左邊:
(0.86)(1/5+30%)
---------------------------------------
= (0.86) (0.2+0.3)
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= 0.86 x 0.5
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= 0.43
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=右邊

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