我想問MATH
如2(4+3e)(4-3e)
我應計2(4+3e)先,還是計(4+3e)(4-3e)先呢?
math2(4+3e)(4-3e)
2009-11-10 1:15 am
回答 (3)
2009-11-10 1:20 am
✔ 最佳答案
兩個方法都得,因為佢係乘數不過(4+3e)(4-3e)就會方便好多
2(4+3e)(4-3e)=2(16-9e square)----difference of square
= 32-18e square
相反第二個就要多幾個step
2009-11-10 1:21 am
both are correct
the answer are also correct
2(4+3e)(4-3e)
=(8+6e)(4-3e)
=32-24e+24e-18e^2
=32-18e^2
or
2(4+3e)(4-3e)
=2(16-12e+12e-9e^2)
=2(16-9e^2)
=32-18e^2
the answer are also correct
2(4+3e)(4-3e)
=(8+6e)(4-3e)
=32-24e+24e-18e^2
=32-18e^2
or
2(4+3e)(4-3e)
=2(16-12e+12e-9e^2)
=2(16-9e^2)
=32-18e^2
2009-11-10 1:19 am
最快方法是計了: (4+3e)(4-3e) 得到個答案再 X 2
收錄日期: 2021-04-13 16:55:33
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