Hoàn thành các phép tính sau:
Giải:
\(\dfrac{7}{9}+\dfrac{5}{12}-\dfrac{3}{4}=\dfrac{7.4}{36}+\dfrac{5.3}{36}-\dfrac{3.9}{36}=\dfrac{28+15-27}{36}=\dfrac{16}{36}=\dfrac{4}{9}\)
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