數學超大問題

2007-07-27 1:06 am
-4a+9a+5b-3B=
6X-7-(4X+5)=
(2A)×(3A)=
(-6x)÷(-2X)=
(15A-4A)×2A=
7x-6-2(3x-1)=

回答 (8)

2007-07-27 1:13 am
✔ 最佳答案
1) 5a+2b
2) 2x-12
3) 5A^2
4) -3x
5) 22A^2
6) x-4

2007-07-26 17:17:46 補充:
-4a 9a 5b-3B= 5a 2b6X-7-(4X+5)= 6x-7-4x-5= 2x-12 (因為-7-5 負負得正,所以加等於12)(2A)×(3A)= 6a^2(兩個a乘埋等於兩個a 所以2次方)(-6x)÷(-2X)=3x(上面打錯左, 係3x 冇-)(15A-4A)×2A=11a x 2a=22a^27x-6-2(3x-1)= 7x-6-6x 2= x-4(拆括號要睇個數字前一個正負號-2x3x = 6x.... -2x-1= 2)
參考: 自己
2007-07-27 8:08 pm
1. -4a + 9a + 5b - 3b
= 5a + 2b

2. 6x - 7 - (4x + 5)
= 6x - 7 - 4x - 5
= 2x - 12
= 2 (x - 6)

3. (2a) x (3a)
= 6a^2

4. (-6x) / (-2x)
= 3

5. (15a - 4a) x 2a
= 11a x 2a
= 22a^2

6. 7x - 6 - 2(3x - 1)
= 7x - 6 - 6x + 2
= x - 4
2007-07-27 2:47 am
1.) -4a+9a+5b-3B
=5a+5b-3B
or
= 5(a+b)-3B

2.) 6X-7-(4X+5)
= 6X-7-1(4X+5)
=6X-7-4X-5
=2X-12

3.) (2A)x(3A)
= 2A(3A)
=6A2次方

4.) (-6x)÷(-2X)
(因為你一個x大一個x細, 所以我唔知你2個係咪一樣, 但都做咗先)
=-6x÷(-2X) or -6x
-------
-2x
=3x (就算x除極都係有一個x係度)

5.) (15A-4A)x2A
= 11Ax2A
=22A 2次方

6.) 7x-6-2(3x-1)
= 7x-6-6x+2
=x-4


我做完喇.
2007-07-27 1:44 am
-4a+9a+5b-3B=9a-4a+2b=5a+2b
6X-7-(4X+5)=6X-7-4X-5=6X-4X-7-5=2X-12
(2A)×(3A)=6A二次方
(-6x)÷(-2X)=-3
(15A-4A)×2A=11A×2A=22A二次方
7x-6-2(3x-1)= 7x-6-6x+2=7x-6x+2-6=x-4
2007-07-27 1:20 am
-4a+9a+5b-3B
=5a+5b-3B
6X-7-(4X+5)
=6X-7-4X+5
=2X-2
(2A)×(3A)
=2Ax3A
=6A(2次方)
(-6x)÷(-2X)
=3
(15A-4A)×2A
=22A(2次方)
7x-6-2(3x-1)
=7x-6-6x+1
=x-5
2007-07-27 1:19 am
-4a+9a+5b-3B=5a+5b-3B
6X-7-(4X+5)=2X-2
(2A)×(3A)=6A
(-6x)÷(-2X)=3
(15A-4A)×2A=22A
7x-6-2(3x-1)= x-4
參考: !
2007-07-27 1:16 am
5a+5b-3B or 5(a+b) - 3B
2X-12 or 2(X-6)
6A^2
3
22A^2
x - 4
參考: 自己心算計
2007-07-27 1:13 am
1.-4a+9a+5b-3B=5a-2b
2.6X-7-(4X+5)=2X-2
3.(2A)×(3A)=6A
4.(-6x)÷(-2X)=3X
5.(15A-4A)×2A=22A
6.7x-6-2(3x-1)=x-8
參考: Me


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