求大神,要详细步骤,谢谢
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(1)
y = -2/x过点A(m, 1), 则1 = -2/m, m = -2, A(-2, 1)
y = kx + b过(0, 3), 则b = 3; 又过(-2, 1): 1 = -2k + 3, k = 1, 直线为y = x + 3
(2)
y = -2/x = x + 3, (x + 1)(x + 2)=0, x = -1, B(-1, 2) (x = -2为点A)
OC = 3, OC上的高为B的横坐标的绝对值1, △BCO的面积为(1/2)*OC*OC上的高=(1/2)*3*1 = 3/2
y = -2/x过点A(m, 1), 则1 = -2/m, m = -2, A(-2, 1)
y = kx + b过(0, 3), 则b = 3; 又过(-2, 1): 1 = -2k + 3, k = 1, 直线为y = x + 3
(2)
y = -2/x = x + 3, (x + 1)(x + 2)=0, x = -1, B(-1, 2) (x = -2为点A)
OC = 3, OC上的高为B的横坐标的绝对值1, △BCO的面积为(1/2)*OC*OC上的高=(1/2)*3*1 = 3/2
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