Hướng dẫn làm bài:
79+512−34=7.436+5.336−3.936=28+15−2736=1636=49
Hướng dẫn làm bài:
79+512−34=7.436+5.336−3.936=28+15−2736=1636=49
\(\dfrac{7}{9}+\dfrac{5}{12}-\dfrac{3}{4}=\dfrac{7.4}{36}+\dfrac{5.3}{36}-\dfrac{3.9}{36}=\dfrac{28+15+27}{36}=\dfrac{16}{36}\dfrac{4}{9}\cdot\)
Hướng dẫn làm bài: 79+512−34=7.436+5.336−3.936=28+15−2736=1636=49