1.如图1,AB//CD,试说明角A+角E+角C=360度.2.如图2,AB//CD,试说明角A1.如图1,AB//CD,试说明角A+角E+角C=360度.2.如图2,AB//CD,试说明角A+角E1+角E2+角C的度数.3如图3,AB//CD,则角A+角E1+角E2+角E3+…+角En+角C=(){用含n

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1.如图1,AB//CD,试说明角A+角E+角C=360度.2.如图2,AB//CD,试说明角A1.如图1,AB//CD,试说明角A+角E+角C=360度.2.如图2,AB//CD,试说明角A+角E1+角E2+角C的度数.3如图3,AB//CD,则角A+角E1+角E2+角E3+…+角En+角C=(){用含n
1.如图1,AB//CD,试说明角A+角E+角C=360度.2.如图2,AB//CD,试说明角A
1.如图1,AB//CD,试说明角A+角E+角C=360度.
2.如图2,AB//CD,试说明角A+角E1+角E2+角C的度数.
3如图3,AB//CD,则角A+角E1+角E2+角E3+…+角En+角C=(){用含n的计算式表明}

1.如图1,AB//CD,试说明角A+角E+角C=360度.2.如图2,AB//CD,试说明角A1.如图1,AB//CD,试说明角A+角E+角C=360度.2.如图2,AB//CD,试说明角A+角E1+角E2+角C的度数.3如图3,AB//CD,则角A+角E1+角E2+角E3+…+角En+角C=(){用含n
1)过E做EF∥AB ∵AB∥CD
∴EF∥CD ∴∠A+∠AEF=180 ∠C+∠CEF=180
∵∠E=∠AEF+∠CEF
∴∠A+∠E+∠C=360
2)做E1F1∥AB,E2F2∥AB
∴AB∥E1F1∥E2F2∥CD
∴∠A+∠AE1F1=180 ∠F1E1E2+∠E1E2F2=180 ∠F2E2C+∠C=180
∴∠A+∠E1+∠E2+∠C=540
3)180(n+1)