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Vanphan2982000
2 năm trước
a) Tìm x biết: x 20% + x : 25% - x: 0,5 + x = 4,9 b) Tính: ( 1 - 1/2 ) x ( 1 - 1/3 ) x ( 1 - 1/4 ) x....x ( 1 - 1/2017 ) x ( 1 - 1/2018 ).
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