( 12 + 45 ) times 23

Lời giải của Luyện Tập 247

Giải chi tiết:

(begin{array}{l},left( {frac{1}{2} + frac{4}{5}} right) times frac{2}{3} = frac{1}{2} times frac{2}{3} + frac{4}{5} times frac{2}{3}\,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, = ,,,,,,frac{1}{3},,,, + ,,,,,frac{8}{{15}}\,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, = ,,,,,,frac{5}{{15}} + frac{8}{{15}}\,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, = ,,,,,,,,frac{{13}}{{15}}end{array})

Chọn B