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0
2022-06-23 15:47:34
-Tìm S hình vuông
A × A
-Tìm R hình tròn
D : 2
-Tìm S hình tròn
R × R ×3,14
-Tìm S phần gạch chéo
S hình vuông -S hình tròn
2022-06-06 15:18:49
1990x1990-1992x1988
=4:))
2022-06-06 15:11:49
Đúng r