Bài 1: Tính giá trị biểu thức: 4/5 x 15/16 + 2 và 1/2 : 2 và 2/9 Bài 2: Tìm X: a. X - 3/5= 1 và 2/3 - 4/9 b. ( 7/12 - 1/4 ) : X = 3/8 E cần gấp sắp thu bài rồi!!!!!

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