各位知識朋友 , 入黎幫我手 ar !!! ( 數學F.1 ) (30)

(a) 3a + 5a
=(3 + 5)a
= 8a

(b) 7b - 2b
= (7 -2 )b
=5b

(c) c + 7c - 4c
= (1 + 7 - 4)c
= 4c

(d) 5 - 3d + 3 - 2d
= 5 + 3 + ( -3 -2)d
= 8 - 5d

(e) a + 3a - 5a
= (1 + 3 - 5)a
= -a

(f) b∕5 + 3b∕5 + 6b∕5
= ( b + 3b + 6b ) / 5
= (10b) / 5
= 2b / 1
= 2b

(g) c - c∕6 + 5c∕6
= 6c/6 - c/6 + 5c/6
= (6c - c + 5c) / 6
= 10c / 6
= 5c / 3

(h) 7d + 2e - 4d - 7f - 5e + 3f
= 7d - 4d + 2e - 5e - 7f + 3f
= (7 - 4 )d + (2 - 5)e + ( -7 + 3 )f
= 3d - 3e - 4f

a) 3a + 5a
=8a

(b) 7b - 2b
=5b

(c) c + 7c - 4c
=4c

(d) 5 - 3d + 3 - 2d
=5+3-3d-2d
=8-5d

(e) a + 3a - 5a
= -a

(f) b∕5 + 3b∕5 + 6b∕5
= 9b/5

(g) c - c∕6 + 5c∕6
=6c/6 - c/6 + 5c/6 (因為6c/6=c...約左個6就會等於c)
=10c/6
=5c/3

(h) 7d + 2e - 4d - 7f - 5e + 3f
=7d -4d + 2e -5e -7f +3f
=3d -3e -4f

呢d都係好基本既簡化...
只要係like term(同類項)就可以加減...
即 a+2a...由於前後都有a...所以就可以相加...
a+2a
=(1+2)a 依度可能唔明...你乘番出黎就會等於上面a + 2a
=3a

減都係同樣意思....
第一位回答會比較清淅...參考下佢...

2007-10-15 09:24:23 補充：
(f) b∕5 3b∕5 6b∕5= 10b/5=2呢個先岩

(a) 3a + 5a
=8a

(b) 7b - 2b
=5b

(c) c + 7c - 4c
=4c

(d) 5 - 3d + 3 - 2d
=8-5d

(e) a + 3a - 5a
=-a

(f) b∕5 + 3b∕5 + 6b∕5
=10b/5

(g) c - c∕6 + 5c∕6
=10c/6

(h) 7d + 2e - 4d - 7f - 5e + 3f
=3d-3e-4f

(a) 3a + 5a
=8a

(b) 7b - 2b
=5b

(c) c + 7c - 4c
=4c

(d) 5 - 3d + 3 - 2d
=5+3-3d-2d
=8-5d

(e) a + 3a - 5a
= -a

(f) b∕5 + 3b∕5 + 6b∕5
=10b /5
=2b

(g) c - c∕6 + 5c∕6
=c -4c/6
=6c/6 -4c/6
=2c /6

(h) 7d + 2e - 4d - 7f - 5e + 3f
=7d-4d+2e-5e-7f+3f
=3d-3e-4f

(a) 3a + 5a
= 8a

(b) 7b - 2b
= 5b

(c) c + 7c - 4c
= 4c

(d) 5 - 3d + 3 - 2d
= 5 + 3 - 3d -2d
= 8 - 5d

(e) a + 3a - 5a
= -a

(f) b/5 + 3b/5 +6b/5
= (b + 3b + 6b)/5
= 10b/5
= 2b

(g) c-c/6 + 5c/6
= (c-c+5c)/6
= 5c/6

(h) 7d + 2e - 4d - 7f - 5e + 3f
= 7d - 4d + 2e - 5e - 7f + 3f
= 3d - 3e - 4f

(a) a(3+5)=8a
(b) b(7-2)=5b
(c) c(1+7-4)=4c
(d) 8-d(3+2)=8-5d
(e) a(1+3-5)=-1a
(f) b(1/5+3/5+6/5)=2b
(g) c(1-1/6+5/6)=11c/6
(h) d(7-4)+e(2-5)+f(3-7)=3d-3e-4f

(a) 3a + 5a
=(3+5)a
=8a
(b) 7b - 2b
=(7-2)b
=5b
(c) c + 7c - 4c
=8c-4c
=4c
(d) 5 - 3d + 3 - 2d
=5+3-3d-2d
=8-5d
(e) a + 3a - 5a
=4a-5a
= -1a
(f) b∕5 + 3b∕5 + 6b∕5
=b+3b+6b/5
=10b/5
(g) c - c∕6 + 5c∕6
=c- c+5c/6
=c- 6c/6
(h) 7d + 2e - 4d - 7f - 5e + 3f
=7d- 4d + 2e-5e -7f+3f
=3d -3e -4f


May be It is wrong ga~~
I am not sure,,,
-v-
hope I can help u la! ^v^

a)a(3+5)
b)b(7-2)
c)c(1+7-4)

e)a(1+3-5)

Sor!我係識呢D 咋!

(a) a(3+5)
=8a
(b) b(7-2)
=5b
(c) c(1+7-4)
=4c
(d) 5 - 3d + 3 - 2d
=5+3-3d-2d
=8-d(3+2)
=8-5d
(e) a + 3a - 5a
=a(1+3-5)
=-a
(f) b∕5 + 3b∕5 + 6b∕5
=(b+3b+6b)/5
=b(1+3+6)/5
=10b/5
(g) c - c∕6 + 5c∕6
=c-c(1+5)/6
=c-c
=0
(h) 7d + 2e - 4d - 7f - 5e + 3f
=7d-4d+2e-5e-7f+3f
=3d-3e-4f

(a) 3a + 5a
=8a

(b) 7b - 2b
=5b

(c) c + 7c - 4c
=4c

(d) 5 - 3d + 3 - 2d
=8-5d

(e) a + 3a - 5a
=-a

(f) b∕5 + 3b∕5 + 6b∕5
=(b+3b+6b)/5
=10b/5
=2b

(g) c - c∕6 + 5c∕6
=0

(h) 7d + 2e - 4d - 7f - 5e + 3f
=3d-3e-4f

(a) 3a + 5a
=(3+5)a
=8a

(b) 7b - 2b
=(7-2)b
=5b

(c) c + 7c - 4c
=1c+7c-4c
=(1+7-4)c
=4c

(d) 5 - 3d + 3 - 2d
=8-3d-2d
=8-(3+2)d
=8-5d

(e) a + 3a - 5a
=1a+3a-5a
=(1+3-5)a
=-1a
=-a

2007-10-14 17:59:09 補充：
(f) b∕5 3b∕5 6b∕5=1b/5 3b/5 6b/5=(1b 3b 6b)/5=10b/5=2b

2007-10-14 18:00:43 補充：
(g) c - c∕6 5c∕6=6c/6-1c/6 5c/6=(6c-1c 5c)/6=10c/6=5c/3

2007-10-14 18:02:19 補充：
(h) 7d 2e - 4d - 7f - 5e 3f =7d-4d 2e-5e-7f 3f=(7-4)d (2-5)e (-7 3)f=3d-3e-4f

2007-10-14 18:03:45 補充：
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