初中数学题目,求解
2个回答
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A(-4,0) ,B=(0,3)
C=(m,0)
case 1: AC=AB
(-4-m)^2+(0-0)^2 = (-4-0)^2 +(0-3)^2
m^2+8m+16=25
m^2+8m-9=0
(m+9)(m-1)=0
m=1 or -9
case 2: AB=BC
(-4-0)^2+(0-3)^2 = (0-m)^2 +(3-0)^2
m^2 +9 = 25
m^2 = 16
m= 4 or -4(rejected)
case 3: AC=BC
(-4-m)^2+(0-0)^2 = (0-m)^2 +(3-0)^2
m^2+8m+16=m^2+9
8m=-7
m=-7/8
ie=1 or -9 or 4 or -7/8
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