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dankhong2001
2 năm trước
Tính bằng cách hợp lí: a) ($\frac{-40}{51}$ . 0,32 . $\frac{17}{20}$) : $\frac{64}{75}$) b) -1 $\frac{5}{7}$ . 15 + $\frac{2}{7}$ . (-15) + (-105) . ($\frac{2}{7}$-$\frac{4}{5}$+$\frac{1}{7}$)
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