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初中数学七年级：相交线与平行线必刷题， 求证：∠1=∠2 ．
初中数学七年级：相交线与平行线必刷题，如图，已知 ∠ABC+∠ECB=180°，∠P=∠Q ． 求证：∠1=∠2 ．
初中数学七年级：相交线与平行线必刷题，基础题、提高题、培优题9/23
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