7x分之y(2y+x)－貨運百科

標題:

7x分之y(2y+x)

發問:

(7x-1)分之x

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最佳解答:

你個問題系唔系 7x分之y = (2y+x) 甘(7x-1)分之x 又等於? 7x分之y =7x/y 7x/y = (2y+x) 7x = (2y+x)y 7x-1 = (2y+x)y -1 (7x - 1)/x = ((2y+x)y -1)/x (7x - 1)/x = ((2y+x)y -1)/x (7x - 1)/x = (2y^2+xy-1)/x (7x - 1)/x = (2y^2 -1)/x + xy/x (7x - 1)/x = (2y^2 -1)/x + y 所以，(7x-1)分之x = (2y^2 -1)/x + y 2007-06-12 14:29:55 補充： to: williamtai429唔好意思, williamtai429, 我中文比較差, 經我查證後, 你講得岩7x分之y = y/7x, 甘你又明唔明佢想做咩呢, 你話你計緊,可唔可以post出來你認為佢既問題想點呢,thanks

其他解答:

救命!! 究竟大家知唔知分之的意思架... 即係分做幾多分, 跟住佔幾多分, 分之前面的數係分母, 後面的數係分子呀, 分之唔等於over架... 唉... 同埋我估個題目應該係expand或者簡化。不過我仲未計到。|||||7x分之y(2y+x) =7x分之2y^2+xy =7x/2y^2+xy/7x =7x/2y^2+y/7