Toán Lớp 7: -5/7.2/11:11/9+12/7 câu này dễ làm nhanh giúp em
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Toán Lớp 7: -5/7.2/11:11/9+12/7 câu này dễ làm nhanh giúp em
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= $\dfrac{-10}{77}$ . $\dfrac{9}{11}$ + $\dfrac{12}{7}$
= $\dfrac{-90}{847}$ + $\dfrac{1452}{847}$
= $\dfrac{1362}{847}$