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nnquyenanh1
2 năm trước
Câu 1: Tính giá trị của biểu thức M = x² – 2xy + y tại x = 10 và y = 4 Câu 2: Các câu sau đây câu nào đúng, câu nào sai - hãy giải thích a) Hình thang có 2 góc kể 1 đáy là hình thang cân. b) Tứ giác có hai đường chéo bằng nhau là hình thang cân. c) Tứ giác có hai góc kể 1 cạnh bằng nhau là hình thang cân. d) Tứ giác có hai góc kể 1 cạnh bù nhau và có hai đường chéo bằng nhau là hình thang cân. e) Tứ giác có hai góc kể 1 cạnh bù nhau và có hai góc đối bù nhau là hình thang cân.
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