F.1 maths代數式(20分)快快,,吾該””

1)（5a-3b+4c)-(2a+5b-6c)
=5a-3b+4c-2a-5b+6c
=3a-8b+10c

2) (2a-7b+3c)-(8a-9c+b)-(10a-2b-5c)
=2a-7b+3c-8a+9c-b-10a+2b+5c
=-16a-6b+17c


1)(250+3p)+(160-5P)+y
=250+3p+160-5p+y
=410-2p+y


2)(5p+2q)-[(2p*2)+(3q)]
=5p+2q-4p-3q
=p-q

3)-6x+50=x+1
50-1=x+6x
x=7

4)3-[5x-(2x-3)]=x-16
3-(5x-2x+3) = x-16
3-5x+2x-3 = x-16
2x+5x+x=-16
x=-2

5)-2[5(3-x)+3]-1=3[2(3-x)+3]
-2(15-5x+3)-1 = 3(6-2x+3)
-2(18-5x)-1 = 3(9-2x)
-36+10x-1 = 27-6x
16x = 64
x=4

6)8(x-2)+4(x+1)=3(x+5)
8x-16+4x+4 = 3x+15
9x = 27
x = 3

1)（5a-3b+4c)-(2a+5b-6c)
=5a-3b+4c-2a-5b+6c
=5a-2a-3b-5b+4c+6c
=3a-8b+10c//

2) (2a-7b+3c)-(8a-9c+b)-(10a-2b-5c)
=2a-7b+3c-8a+9c-b-10a+2b+5c
=2a-8a-10a-7b-b+2b+3c+9c+5c
=-16a-6b+17c//

1)(250+3p)+(160-5P)+y=(500+12p)
250+3p+160-5p+y=500+12p
410-2p+y=500+12p
-90+y=14p
y=14p+90//

2)(5p+2q)-[(2p*2)+(3q)]
=5p-2q-(2p*2+3q)
=5p+2q-4p-3q
=p-q//

3)-6x+50=x+1
49=7x
x=7//

4)3-[5x-(2x-3)]=x-16
3-(5x-2x-3=x-16
3-5x+2x-3=x-16
-3x=x-16
4x=16
x=4//

5)-2[5(3-x)+3]-1=3[2(3-x)+3]
-2(15-5x+3)-1=3(6-2x+3)
-2(18-5x)-1=3(9-2x)
-36+10x-1=27-6x
10x+6x=27+37
16x=64
x=4//

6)8(x-2)+4(x+1)=3(x+5)
8x-16+4x+4=3x+15
8x+4x-3x=16-4+15
9x=27
x=3//

(1)
(5a - 3b + 4c) - (2a + 5b - 6c)
= 5a - 3b + 4c - 2a - 5b + 6c
= 3a - 8b + 10c//

(2)
(2a - 7b + 3c) - (8a - 9c + b) - (10a - 2b - 5c)
= 2a - 7b + 3c - 8a + 9c - b - 10a + 2b + 5c
= -16a - 6b + 17c//

方程(1)同(2)做唔到，第2條唔係方程，第1條3個未知數(p, P, y)1條式做唔到。

(3)
-6x + 50 = x + 1
49 = 7x
x = 7//

(4)
3 - [5x - (2x - 3)] = x - 16
19 = x + [5x - (2x - 3)]
19 = x + (5x - 2x + 3)
19 = x + 3x + 3
16 = 4x
x = 4//

(5)
-2[5(3 - x) + 3] - 1 = 3[2(3 - x) + 3]
-2(15 - 5x + 3) - 1 = 3(6 - 2x +3)
-30 + 10x - 6 - 1 = 18 - 6x + 9
10x - 37 = 27 - 6x
16x = 64
x = 4//

(6)
8(x - 2) + 4(x + 1) = 3(x + 5)
8x - 16 + 4x + 4 = 3x + 15
9x = 27
x = 3//

化簡
1) (5a-3b+4c)-(2a+5b-6c)
=5a-2a-3b-5b+4c+6c
=3a-8b+10c

2) (2a-7b+3c)-(8a-9c+b)-(10a-2b-5c)
=2a-8a-10a-7b-b+2b+3c+9c+5c
=-16a-6b+17c
=-(16a+6b-17c)

方程
1)(250+3p)+(160-5P)+y=(500+12p)
410+3p-5p+y=500+12p
410-500+y=12p-3p+5p
-90+y=14p
y=90+14p
2)(5p+2q)-[(2p*2)+(3q)]
=5p+2q-(4p+3q)
=5p+2q-4p-3q
=p-q
3)-6x+50=x+1
50-1=x+6x
49=7x
x=7
4)3-[5x-(2x-3)]=x-16
3-(5x-2x+3)=x-16
3-3x-3=x-16
16=x+3x
4x=16
x=4
5)-2[5(3-x)+3]-1=3[2(3-x)+3]
-2(15-5x+3)-1=3(6-2x+3)
-30+10x-6-1=18-6x+9
10x-37=27-6x
16x=27+37
16x=64
x=4
6)8(x-2)+4(x+1)=3(x+5)
8x-16+4x+4=3x+15
12x-12=3x+15
12x-3x=15-12
9x=3
x=1/3

2008-05-25 12:15:16 補充：
6)8(x-2)+4(x+1)=3(x+5)
8x-16+4x+4=3x+15
12x-12=3x+15
12x-3x=15+12
9x=27
x=3

代數式
1)5a-3b 4c-2a-5b 6c
=5a-2a-3b-5b 4c 6c
=3a-2b 10c
2)2a-7b 3c-8a 9c-b-10a 2b 5c
=-10a-8a 2a-7b 2b-b 3c 9c 5c
=4a-6b 17c
方程
1)250 3p 160-5p y=500 12p
250 160-500=-3p 5p 12p y
-90=14p y
3)-6x 50=x 1
-6x-x=1-50
-7x=-49
x=49
4)3-5x-2x 3=x-16
3 10 3=x 5x 2x
22=8x
6)8x-16 4x 4=3x 15
8x 4x-3x=16-4 15
9x=27
x=3

2008-05-25 12:03:27 補充：
自己做la,dont ve lazy.

1) (5-2)a+(-3-5)b+[4-(-6)]c
2) (2-8-10)a[(-7)-1-(-2)]b+[3-(-9)-(-5)]c

1) no solution, since 2 unknow, 1 equation cannot solve the ans.
2) no solution, this not a equation.
3) x=7
4) -3x=x-16
x=4
5) -10(3-x)+3-1=6(3-x)+9 <=solve the ans yourself
6) (8x-16)+(4x+4)=3x+15 <=solve the ans yourself

1)（5a-3b+4c)-(2a+5b-6c)
=5a-3b+4c-2a-5b+6c
=(5-2)a+(-3-5)b+(4+6)c
=3a-8b+10c
2) (2a-7b+3c)-(8a-9c+b)-(10a-2b-5c)
=2a-7b+3c-8a+9c-b-10a+2b+5c
=(2-8-10)a+(-7-1+2)b+(3+9+5)c
=-16a-6b+17c
=17c-16a-6b

1)（5a-3b+4c)-(2a+5b-6c)
=5a-3b+4c-2a-5b+6c
=3a-8b+10c

2) (2a-7b+3c)-(8a-9c+b)-(10a-2b-5c)
=2a-7b+3c-8a+9c-b-10a+2b+5c
=-16a-6b+17c


1)(250+3p)+(160-5P)+y=(500+12p)
250+3p+160-5p+y = 500+12p
410-2p+y = 500+12p
y = 90+14p

2)(5p+2q)-[(2p*2)+(3q)]
=5p+2q-4p-3q
=p-q

3)-6x+50=x+1
49 = 7x
x = 7

4)3-[5x-(2x-3)]=x-16
3-(5x-2x+3) = x-16
3-5x+2x-3 = x-16
16 = 4x
x = 4

5)-2[5(3-x)+3]-1=3[2(3-x)+3]
-2(15-5x+3)-1 = 3(6-2x+3)
-2(18-5x)-1 = 3(9-2x)
-36+10x-1 = 27-6x
16x = 64
x=4

6)8(x-2)+4(x+1)=3(x+5)
8x-16+4x+4 = 3x+15
9x = 27
x = 3

化簡:
1)（5a-3b+4c)-(2a+5b-6c)
= 5a-3b+4c-2a-5b+6c
= 5a-2a-3b-5b+4c+6c
= 3a-8b+10c

2) (2a-7b+3c)-(8a-9c+b)-(10a-2b-5c)
= 2a-7b+3c-8a+9c-b-10a+2b+5c
= 2a-8a-10a-7b-b+2b+3c+9c+5c

方程:
1)(250+3p)+(160-5P)+y=(500+12p)
250+3p+160-5p=500+12p
10p=90

2)(5p+2q)-[(2p*2)+(3q)]

3)-6x+50=x+1
-7x=-49
x=7

4)3-[5x-(2x-3)]=x-16
3-(5x-2x+3)=x-16
3-5x+2x-3=x-16
-3x=x-16
-4x=-16
x=4

5)-2[5(3-x)+3]-1=3[2(3-x)+3]
-2(15-5x+3)-1=3(6-2x+3)
-30+10x-6-1=18-6x+9
16x=64
x=4

6)8(x-2)+4(x+1)=3(x+5)
8x-16+4x+4=3x+15
6x=30
x=5

2008-05-25 11:58:48 補充：
補充以上錯漏

化簡
2) (2a-7b+3c)-(8a-9c+b)-(10a-2b-5c)
= 2a-7b+3c-8a+9c-b-10a+2b+5c
= 2a-8a-10a-7b-b+2b+3c+9c+5c
= -16a-6b+17c

方程:
1) (250+3p)+(160-5P)+y=(500+12p)
250+3p+160-5p=500+12p
10p=90
p=9

2) (5p+2q)-[(2p*2)+(3q)]
= (5p+2q)-(4p+3q)
= 5p+2q-4p-3q
= p-q