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hoangnguyen811
2 năm trước
1. tính giá trị biểu thức sau: a. 5/7 : 1/3 x 2/5 b. 47,2 x 5 + 107,1 : 2,5 2. tìm x,biết: a. x- 5/7 = 2/9 b. x + 35,2 = 28,74 x 3
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