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catlt01012004
2 năm trước
5. hai hình chữ nhật có phần chung là hình tứ giác ABCD [xem hình vẽ]. A. giải thích tài sao hình tứ giác ABCD có từng cặp cạnh đối diện song song. B.đo độ dài các cạnh của hình tứ giác ABCD rồi nhận xét xem từng cặp cạnh đối diện có bằng nhau không. C.cho biết hình tứ giác ABCD là hình bình hành có độ dài đáy DC là 4cm, chiều cao AH là 2cm. tính diện tích hình bình hành ABCD. 1/c.phân số 5 phần 9 bằng phân số nào dưới đây? a. 10/27 b. 15/18 c.15/27 d.20/27
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