13少 16-4-2011 12:41
6下B--13簡易方程(一)
1. X + 4.1 = 7.3 -------------> 3.2
2. b x 75% = 24 -------------> 32
3. 5M / 7 = 30 -------------> 42
4. H(2 - 3/5) = 42 -----------> 30
5. g(39% - 24%) = 6 ----------> 40
6. A + 1.5 = 1.83
A = 1.83 - 1.5
A = 0.33
7. 3r = 946.2
r = 946.2 / 3
r = 315.4
8. 35%K = 28
35/100 K = 28
K = 28 x 100/35
K = 80
驗算：
當K = 80
左邊 = 35% x 80
= 35/100 x 80
= 28
= 右邊
9. D - 7/8 = 1/4
D = 1/4 + 7/8
D = 2/8 + 7/8
D = 1(1/8)
驗算：
當D = 1 1/8
左邊 = 1 1/8 - 7/8
= 9/8 - 7/8
= 1/4
= 右邊
10. n + 1.78 = 2.47
n = 2.47 - 1.78
n = 0.69
驗算：
當n = 0.69
左邊 = 0.69 + 1.78
= 2.47
= 右邊
11. 5/6 x L = 8
L = 8 x 6/5
L = 48/5
L = 9(3/5)
驗算：
當L = 9 3/5
左邊 = 5/6 x 9 3/5
= 5/6 x 48/5
= 8
= 右邊
12. 5t/8 x 8/5 = 2.5 x 8/5
t = 4
驗算：
當t = 4
左邊 = 5 x 4 / 8
= 20 / 8
= 2.5
= 右邊
13. Y(2 4/12 - 1 9/12) = 1.4
Y(1 16/12 - 1 9/12) = 1.4
7/12Y x 12/7 = 1.4 x 12/7
Y = 2.4
驗算：
當Y = 24
左邊 = 2.4 x (2 1/3 - 1 3/4)
= 2.4 x (1 16/12 - 1 9/12)
= 2.4 x 7/12
= 1.4
= 右邊
14. F(0.2 + 0.3) = 0.43
0.5F = 0.43
0.5F / 0.5 = 0.43 / 0.5
F = 0.86
驗算：
當F = 0.86
左邊 = 0.86 (1/5 + 30%)
= 0.86(0.2 + 0.3)
= 0.86(0.5)
= 0.43
= 右邊