1.(8a-b+2c)+(-b-3c+6a)-(8c+7a-6a)
2.(2c-x+1)-(6x-7c)+(4-5x)
3.1-(2b-1/2a)+(2a+1/2b-3/2)
4.3x(x-2)+4(3x-5)
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2007-10-22 1:26 am
回答 (5)
2007-10-22 1:39 am
✔ 最佳答案
1.(8a-b+2c)+(-b-3c+6a)-(8c+7a-6a)=8a-b+2c-b-3c+6a-8c-7a+6a
=7a-2b-9c
2.(2c-x+1)-(6x-7c)+(4-5x)
=2c-x+1-6x+7c+4-5x
=9c-12x+5
4.3x(x-2)+4(3x-5)
.....2
=3x -6x+12x-20
.....2
=3x +6x-20
那些點不關事。（因爲平方寫不出來）
第三題不懂得寫。
2007-10-26 6:20 am
1.(8a-b+2c)+(-b-3c+6a)-(8c+7a-6a)
=8a-b+2c+-b-3c+6a-8c-7a+6a
=13a-2b-9c
2.(2c-x+1)-(6x-7c)+(4-5x)
=2c-x+1-6x+7c+4-5x
=9c-12x+12
3.1-(2b-1/2a)+(2a+1/2b-3/2)
=1-2b+1/2a+2a+1/2b-3/2
=-1/2-3/2b+5/2a
4.3x(x-2)+4(3x-5)
=3x-6+12x-20
=15x-26
=8a-b+2c+-b-3c+6a-8c-7a+6a
=13a-2b-9c
2.(2c-x+1)-(6x-7c)+(4-5x)
=2c-x+1-6x+7c+4-5x
=9c-12x+12
3.1-(2b-1/2a)+(2a+1/2b-3/2)
=1-2b+1/2a+2a+1/2b-3/2
=-1/2-3/2b+5/2a
4.3x(x-2)+4(3x-5)
=3x-6+12x-20
=15x-26
參考: maths test book
2007-10-25 3:59 am
1.
(8a-b+2c)+(-b-3c+6a)-(8c+7a-6a)
=8a-b+2c-b-3c+6a-8c-7a+6a
=13a-2b-9c
2.
(2c-x+1)-(6x-7c)+(4-5x)
=2c-x+1-6x+7c+4-5x
=9c-11x+5
(8a-b+2c)+(-b-3c+6a)-(8c+7a-6a)
=8a-b+2c-b-3c+6a-8c-7a+6a
=13a-2b-9c
2.
(2c-x+1)-(6x-7c)+(4-5x)
=2c-x+1-6x+7c+4-5x
=9c-11x+5
2007-10-23 2:44 am
1.(8a-b+2c)+(-b-3c+6a)-(8c+7a-6a)
=8a-b+2c+-b-3c+6a-8c-7a+6a
=13a-2b-9c
2.(2c-x+1)-(6x-7c)+(4-5x)
=2c-x+1-6x+7c+4-5x
=9c-12x+12
3.1-(2b-1/2a)+(2a+1/2b-3/2)
=1-2b+1/2a+2a+1/2b-3/2
=-1/2-3/2b+5/2a
4.3x(x-2)+4(3x-5)
=3x-6+12x-20
=15x-26
2007-10-22 18:47:01 補充：
第二個做法(唔明你想話3x x (x-2)定3 x (x-2))3x(x-2)+4(3x-5)=3x^2-6x+12x-20=3x^2+6x-20
=8a-b+2c+-b-3c+6a-8c-7a+6a
=13a-2b-9c
2.(2c-x+1)-(6x-7c)+(4-5x)
=2c-x+1-6x+7c+4-5x
=9c-12x+12
3.1-(2b-1/2a)+(2a+1/2b-3/2)
=1-2b+1/2a+2a+1/2b-3/2
=-1/2-3/2b+5/2a
4.3x(x-2)+4(3x-5)
=3x-6+12x-20
=15x-26
2007-10-22 18:47:01 補充：
第二個做法(唔明你想話3x x (x-2)定3 x (x-2))3x(x-2)+4(3x-5)=3x^2-6x+12x-20=3x^2+6x-20
2007-10-22 5:40 am
1.(8a-b+2c)+(-b-3c+6a)-(8c+7a-6a)
=8a-b+2c-b-3c+6a-8c-7a+6a
=13a-2b-9c
2.(2c-x+1)-(6x-7c)+(4-5x)
=2c-x+1-6x+7c+4-5x
=9c-12x+5
=8a-b+2c-b-3c+6a-8c-7a+6a
=13a-2b-9c
2.(2c-x+1)-(6x-7c)+(4-5x)
=2c-x+1-6x+7c+4-5x
=9c-12x+5
收錄日期: 2021-04-13 19:08:24
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https://hk.answers.yahoo.com/question/index?qid=20071021000051KK03518