练习题1和2.
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练习题1和2.
练习题1和2.
练习题1和2.
1,
∵∠CAD=30°
∴∠ACD=60°
∵∠CBD=45°
∴∠BCD=45°
∵∠ACB=∠ACD-∠BCD
∴∠ACD=15°
2,
∵四边形内角和=360°
∠A=150°
∠B=∠D=40°
∴∠C=360°-∠A-∠B-∠D=130°