有數學唔識做？？

2007-08-22 5:05 am

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例:2a(a-3) =2axa+2ax(-3) =2a2次方
1.5(5x-4y)
2.7(3x-2)
3.4a(3a-8)
4.4n(3m+3)
要有過程

回答 (3)

2007-08-22 8:03 am

✔ 最佳答案

1. 5(5x-4y)
=5*5x-5*4y
=25x-20y

2. 7(3x-2)
=7*3x-7*2
=21c-14

3. 4a(3a-8)
=4a*3a-4a*8
=12a2次-32a

4. 4n(3m+3n)
=4n*3m+4n*3n
=12mn+12n2次

參考: 我

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2007-08-22 6:34 am

1. 5*5x+5*-4y
=25x-20y

2 .7*3x+7*-2
=21x-14
=-294

3.4a*3a+4a*-8
=12a2次方+32a

4.4n*3m+4n*3
=12nm+12n

I hope it will be helpful to you.

參考: myself

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2007-08-22 5:16 am

1.
5(5x-4y)
=5*5x-5*-4y
=25x+20y

2.
7(3x-2)
=7*3x-7*-2
=21x+14

3.
4a(3a-8)
=4a*3a-4a*-8
=12a2次方+32a

4.
4n(3m+3)
=4n*3m+4n*3
=12mn+12n

參考: 自己

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