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標題:
聯立二元一次方程
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聯立二元一次方程.thx http://www.flickr.com/photos/45632549@N03/5567775700/sizes/l/in/photostream/
最佳解答:
8a.) 2x+2y = 24 --------------(1) 2x = 4y - 3 => 2x - 4y = -3 -----------(2) b.) (1) - (2), 6y = 27 y = 27/6 Sub y = 27/6 into (1) 2x + 9 = 24 2x = 15 x = 15/2 長方形面積 = xy = 27/6 * 15/2 = 9/2 * 15/2 = 135/4 cm^2 9.) 設成人票價為$x, 兒童票價為$y, 3x + y = 1170 ----------(1) 2x + 5y = 1755 --------(2) (1)*5 - (2), 13x = 4095 x = 315 Sub x = 315 into (1), 945 + y = 1170 y = 225 1名成人及一名兒童共收費 = 225 + 315 = $540
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