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一公頃等於15畝所以20公頃等於20*15=300畝《答案絕對正確,
25
1公頃=10 000平方米 1平方千米=1 000 000平方米 所以1平方千米=100公頃 所以25分之3平方千米=3/25×100=12公頃
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