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2 năm trước
Tính diện tích hình thang vuông có cạnh bên 1 vuông góc với hai đáy, đáy lớn a và đáy bé b: A) 1=1,2;a=3,6m;b=1,4 B) 1= 5dm; a=1,5;b= 80cm C)1=1/4m; a=2/3m;b=1/2 m
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