maths(5)

2007-10-16 12:49 am
14.x-6=(x-3)/4
22.1/9(h+9)=5/6-1/2(h+7)

回答 (3)

2007-10-16 2:41 am
14.
x-6=(x-3)/4
4(x-6)=x-3
4x-24=x-3
4x-x=24-3
3x=21
x = 7

22.
1/9(h+9)=5/6-1/2(h+7)
(2h+18)/18 = 15/18 - (9h+63)/18
2h+18 = 15 - (9h+63)
2h+18 = -9h - 48
11h = -66
h = -6
2007-10-16 1:17 am
14.

x-6=(x-3)/4

4x-24=x-3

4x - x = -3+24

3x = 21

x = 7

22.

1/9(h+9)=5/6-1/2(h+7)

(2h+18)/18 = 15/18 - (9h+63)/18

2h+18 = 15 - (9h+63)

2h+18 = -9h - 48

11h = -66

h = -6
2007-10-16 1:03 am
14. x-6=(x-3)/4
4(x-6)=4x-24=x-3
4x-x=24-3
3x=21
x=21/3=7


22. 1/9(h+9)=5/6-1/2(h+7)
(h+9)/9=5/6-3/6(h+7)=[5-3(h+7)]/6
6(h+9)=9(5-3h-21)
6h+54=45-27h-189
6h+27h=45-189-54
33h=-198
h=-198/33=-6


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