1題 F.1數,急!!!10分

2008-09-19 5:37 am
一、 1.5x〔(+1)-(+0.2)除以(-3.125)

要寫曬成條式,答案係-0.384

我只求過情,plz

回答 (5)

2008-09-19 6:10 am
✔ 最佳答案
1.5x〔(+1)-(+0.2)〕÷(-3.125)

=1.5x × ( 0.8 ) ÷ (-3.125) ←﹝ ( +1) - ( +0.2 )﹞= 0.8

=1.2x ÷ (-3.125) ←1.5x × 0.8 = 1.2x

=-0.384 ←Answer

2008-09-18 22:14:24 補充:
每計一步的時候一定要清楚了解那一步的計法,唔係的話會比較容易計錯數,所以了解計算過程係好重要的!
參考: 我計過五年中一因式分解─展開的經驗, 教了我三年數的老師
2008-09-19 6:14 am
1.5x〔(+1)-(+0.2)〕除以(-3.125)
=1.5x 〔1 - 0.2 〕除以(-3.125)
=1.5x 〔0.8 〕除以(-3.125)
=1.2 除以(-3.125)
=0.384

2008-09-18 22:15:58 補充:
= -0.384 才對
漏了負號
2008-09-19 6:14 am
1.5x〔(+1)-(+0.2)〕除以(-3.125)

=1.5x(+0.8)除以(-3.125)

=(+1.2)除以(-3.125)

=(-0.384)
2008-09-19 5:55 am
1.5x〔(+1)-(+0.2)〕除以(-3.125)

=1.5 x 0.8 除(-3.125)
=1.5 x (-0.256)
= -0.384
參考: myself
2008-09-19 5:45 am
1.5x〔(+1)-(+0.2)除以(-3.125)
= 1.5x (+1)-0.2 除以(-3.125)
= 1.5x0.8 除以(-3.125)
= 1.2除以(-3.125)
= -0.384
參考: me


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