有關數學問題幫忙 @ dvhtlbz的部落格

標題:

有關數學問題幫忙

發問:

1.1= 25a+c ----------------- (1) 0.8= -21a+h ----------------- (2) 0= ab+c ----------------- (3) 0.3= -ab+h ----------------- (4) 求 a,b,c,h

最佳解答:

In (1), 1.1 = 25a+c c = 1.1-25a ------------------ (5) Sub (5) into (3), 0 = ab + 1.1 - 25a ab = -1.1 + 25a -------------------------(6) Sub (6) into (4), 0.3 = -(-1.1 + 25a) + h -0.8= -25a + h h = 25a - 0.8----------------------(7) Sub (7) into (2), 0.8 = -21a + 25a - 0.8 1.6 = 4a a = 0.4-----------------(8) Sub (8) into (1), 1.1 = 25(0.4) + c c = -8.9 ------------------(9) aub (8) into (6), 0.4b = -1.1 + 25(0.4) b = 22.25-----------------(10) Sub (8) into (7), h = 25(0.4) - 0.8 h =9.2----------------(11) From (8),(9),(10),(11), a= 0.4 b= 22.25 c= -8.9 h = 9.2