已知直线y=-x+2与直线y=2x/3+4交于A点且两直线与x轴得交点分别为B、C,求三角形ABC的面积
如题!急死了!
人气:131 ℃ 时间:2019-08-19 14:49:16
解答
x轴y=0
y=-x+2=0
x=2
y=2x/3+4=0
x=-6
所以B(2,0),B(-6,0)
则AB=|-6-2|=8
y=-x+2=2x/3+4
5x/3=-2
x=-6/5
y=-x+2=16/5
所以A到x轴距离=16/5
所以面积=8×16/5÷2=64/5
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