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2019年春七年级数学下册第10章相交线、平行线和平移10.3平行线的性质第2课时平行线的性质23教学课件（新版）沪科版.pptx

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2019年春七年级数学下册第10章相交线、平行线和平移10.3平行线的性质第2课时平行线的性质23教学课件（新版）沪科版.pptx_第1页
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第10章 相交线、平行线与平移,10.3 平行线的性质,解:因为ABCD,所以BAD+DAC+ACD=180, 因为BADDACACD=234,设BAD=2x,DAC=3x,ACD=4x,则2x+3x+4x=180,解得x=20,所以C=80.,解:ABCD,ABC=BCD, ABE=DCF,EBC=FCB, BECF,E=F.,

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