HeLp Me !! (maths F.1)

1. 4a+5b-2a+b
=4a-2a+5b+b
=2a+6b

2. x+6y-4x-2y
=x-4x+6y-2y
=-3x+4y

3. p+4q+3p-2q
=p+3p+4q-2q
=4p-2q

4. c+d+3c-2d
=c+3c+d-2d
=4c-d

5. 9t+10u+/-3u-t
=9t-t+10u+/-3u
=8t+13u/+7u

6. 8v+w-v-w
=8v-v+w-w
=7v

7. 5a+3b-c+a-2b+4c
=5a+a+3b-2b-c+4c
=6a+b+3c

8. 3e-f+g-5e-4f-5g
=3e-5e-f-4f+g-5g
=-2e-5f-4g

9. 44u-5v+w-4u-6v+2w
=44u-4u-5v-6v+w+2w
=40u-11v+3w

10. 5i-j+3k+3i+9j-2k
=5i+3i-j+9j+3k-2k
=8i+8j+k

11. 2x+5y+4z-10x+9y-z
=2x-10x+5y+9y+4z-z
=-8x+14y+3z

12. 8p-4q+7r+10p-5q-6r
=8p+10p-4q-5q+7r-6r
=18p-9q+r

1.2a+6b
2.4y-3x
3.6p
4.4c-d
5.8t+30u
6.7v
7.6a+b+3c
8.-2e-5f-4g
9.40u-11v+3w
10.8i+8j+k
11.-8x+14y+3z
12.18p-9q+r

100%correct.

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

2) x + 6y - 4x - 2y = 4y-3x


3) p +4q + 3p -2q = 4p+2q = 2(2p+q)

4) c + d +3c -2d = 4c-d

5) 9t + 10u (+)3u - t =8t+13u

6) 8v + w - v -w =7v

7) 5a +3b -c +a - 2b + 4c = a-b+3c

8) 3e - f + g - 5e - 4f - 5g = -2e-5f-4g

9) 44u - 5v + w - 4u - 6v +2w = 40u-11v+3w


10) 5i - j + 3k +3i +9j -2k = 8i+8j+k

11) 2x +5y +4z - 10x + 9y - z = -8x+14y+3z

12) 8p - 4q +7r +10p - 5q -6r = 18p-9q+r

1.4a-2a+5b+b=2a+6b
2.x-4x+6y-2y=-3x+4y
3.p+3p+4q-2q=4p+2q
4.c+3c+d-2d=4c+(-d)
5.?
6.8v-v+w-w=7v+0
7.
8.
9.
10.
11.
12.

2007-10-19 20:02:51 補充：
7.5a+a+3b-2b-c+4c= 6a+b-5c8.3e-5e-f-4f+g-5g= -2-(-3f)+(-4g)9.44u-4u-5v-6v+w+2w= 40u-(-v)+3w10.5i+3i-j+9j+3k-2k= 8i-10j+k11.2x-10x+5y+9y+4z-z= -8x+14y+3z12.8p+10p-4q-5q+7r-6r= 18p-(-p)+r

ALL ANSWERS EQUALS TO ZERO