2017学年度八年级数学上册7.4平行线的性质导学案（无答案）（新版）北师大版.doc

7.4 7.4 1 a b a c 1 2 3 a b c d b c _ 2 D,E,F AB,AC,DG 1 + 2=180 0 3= B AED C 1 2 3 3 3 2 3 5 1 AB CD O 1 2 1= 2 _ 3+ 1+ _ 1= 3 _ CD/AB _ 2 : 1 7-8 AB CD 1 2 AB CD EF 1= 2 1 2 M GH EMH= 2 7-9 M AB GH CD 1 2 1= 2 2 (3 10 5 5 ( ) 4 1 D B A C O E 4 2 3