方程式 唔該 幫忙

2007-02-07 2:48 am
請幫我解以下方程。詳細列出部
{【(1.6A)(240-X)-(A)(240)】÷(A)(240) }×100% =【(1.21-1)÷1】×100﹪


X =?

回答 (2)

2007-02-09 3:54 am
{【(1.6A)(240-X)-(A)(240)】÷【(A)(240)】 }×100% =【(1.21-1)÷1】×100﹪
【(1.6)(240-X)-240】÷(240) = 0.21
(1.6)(240-X)-240 = 240(0.21)
                  384 - 1.6X = 240 + 50.4
        384 - 1.6X = 290.4
-1.6X = 290.4 - 384
                    -1.6X = -93.6
                  X = -93.6/(-1.6)
X = 58.5
參考: me
2007-02-07 3:38 am
{【(1.6A)(240-X)-(A)(240)】÷【(A)(240)】 }×100% =【(1.21-1)÷1】×100﹪
【(1.6)(240-X)-240】÷(240) = 0.21
(1.6)(240-X)-240 = 240(0.21)
384 - 1.6X = 240 + 50.4
384 - 1.6X = 290.4
-1.6X = 290.4 - 384
-1.6X = -93.6
X = -93.6/(-1.6)
X = 58.5


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