數學功課----------６年級方式程問題．．煩死＊●＊

1.w-1/4=2/3w
1/3w=1/4
w=3/4
2:2/3b+4b-6=27+b
11/3b=33
b=33x3/11
b=9
3.25-5a=8+6a-5
11a=25-3
a=2
4.2/5c-8+2c=64
12/5c=72
c=72/12x5
c=30
5.12q+40=18q-2q
4q=40
q=10
6.3A× 75%=2A+1.5
225%A-2A=1.5
0.25A=1.5
A=6
7. (1-1/2+1/3)×N =25/36
N=(25/36)/(1-1/2+1/3)
N=25/36/(5/6)
N=5/6
8. 3.6-1/2X=4.5-X
0.5X=0.9
X=1.8
9 Y/3+Y/12=Y-40
2/3Y=40
Y=60
10. 80-W=2W ×150%
4W=80
W=20
11.3/5E+16=E-4
2/5E=20
E=50
12. 1/3×A+A=24
4/3A=24
A=18
13.7.2-3H=11×3H
3Hx12=7.2
3H=0.6
H=0.2
14. 2M+4/13=13-M
3M=165/13
M=15/13
15 L×80%=L-12
0.2L= 12
L=60
16. 17P+6P=10+11P+2
12P=12
P=1
17. 30=20+5/6D
5/6D=10
D=12

1: w-1/4=2/3w w=??
w -= 2/3w + 1/4
w - 2/3w = 1/4
1/3w = 1/4
w =1/4 ÷ 1/3
w = 1/4 x 3/1
w = 3/4

2:2/3b+4b-6=27+b b=??
4 2/3b - 6 =27 + b
4 2/3b - b = 27 + 6
3 2/3b = 33
b = 33 ÷ 3 2/3
b = 33 x 3/11
b = 9

3.25-5a=8+6a-5 a=??
25 - 5a = 8 + 1a
25 - 8 = 1a + 5 a
17 = 6a
a = 17/6
a = 2 5/6


如此類推

w - 1/4 = 2/3w w
1 - 1/4w = 2/3w
1 = 2/3w + 1/4w
1 = 8/12w + 3/12w
1 = 11/12w
w = 1 1/12

2007-05-17 17:47:06 補充：
計錯了 !