F.1數學－方程

1. X-6=18, X=18+6=24

2. X/12=-2, X=12(-2),=-24

3. 3N/5=9, 3N=9*5, N=45/3=15

4. 39/b=3, 3b=39, b=39/3=13

5. 5X+1=16, 5X=16-1, X=15/5=3

6. 15-6X=3, 15-3=6X, X=12/6=2

7. 5X=18+2X, 5X-2X=18, 3X=18, X=6

8. 4Y-8-Y+2=0, 4Y-Y=8-2, 3Y=6, Y=2

9. 5+4X-9-2X???

10. 6Z-14=9Z+4, 9Z-6Z=-14-4, 3Z=-18, Z= -6

11. 3(2+X)-X=14, 6+3X-X=14, 2X=14-6, X=4

12.A=2(2A+3), A=4A+6, 4A-A= -6, A= -6/3= -2

13.X/3-2/3=5, (X-2)/3=5, X-2=15, X=17

14.M/3+4M/9=-21, 3M/9+4M/9=-21, 3M+4M=-21*9, 7M= -189, M=-27

15.5X-3(X+6)=9-X, 5X-3X-18=9-X, 2X+X=9+18, 3X=27, X=9

16.2(A-0.5)=4.5-0.5(A-4), 2A-1=4.5-0.5A+2, 2.5A=6.5+1, A=3

17.2K/3-K+2/4=2, ＜－－2K/3-(K+2)/4=2??

18.X+3/20=21-X/28, <-----(X+3)/20=(21-X)/28??

2007-02-14 10:15:05 補充：
9. 5 4X-9-2X =0, 2X=9-5, X=4/2=217.2K/3-(K 2)/4=2, ﹝4(2K)-3(K 2)﹞/12=2, 8K-3K-6=2*12, 5K=24 6, K=30/5=618.(X 3)/20=(21-X)/28, 28(X 3)=20(21-X), 28X 84=420-20X, 48X=420-84, X=336/48=7

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