直接写得数．= 4﹣1.63= = == = = == 27×5%= %= =
过A点画直线的平行线．
28、过A点画已知直线的平行线和垂线．
过A点作已知直线的垂线，过B点作已知直线的平行线．
过P点画出如图已知直线的平行线．
= 4﹣1.63= 
= 
=
= 
= 
= 
=
= 27×5%= 
%= 
=
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