Question

[ 1+2\(\dfrac{1}{3}\)-3\(\dfrac{1}{4}\)]:[1+3\(\dfrac{7}{12}\)-4\(\dfrac{1}{2}\)]

tính

Answer 1

sao lại có dấu x to đùng thế kia

Answer 2

\(\left[1+2\dfrac{1}{3}-3\dfrac{1}{4}\right]:\left[1+3\dfrac{7}{12}-4\dfrac{1}{2}\right]\)

\(=\left[3\dfrac{1}{3}-3\dfrac{1}{4}\right]:\left[4\dfrac{7}{12}-4\dfrac{1}{2}\right]\)

\(=\left[3\dfrac{4}{12}-3\dfrac{3}{12}\right]:\left[4\dfrac{7}{12}-4\dfrac{6}{12}\right]\)

\(=\dfrac{1}{12}:\dfrac{1}{12}\)

\(=1\)

Answer 3

dấu x để làm j vậy

Answer 4

Ta có: \(\left(1+2\dfrac{1}{3}-3\dfrac{1}{4}\right):\left(1+3\dfrac{7}{12}-4\dfrac{1}{2}\right)\)

\(=\left(1+\dfrac{7}{3}-\dfrac{13}{4}\right):\left(1+\dfrac{43}{12}-\dfrac{9}{2}\right)\)

\(=\left(\dfrac{12}{12}+\dfrac{28}{12}-\dfrac{39}{12}\right):\left(\dfrac{12}{12}+\dfrac{43}{12}-\dfrac{54}{12}\right)\)

\(=\dfrac{1}{12}:\dfrac{1}{12}\)

=1

Answer 5

dấu x làm hình cho đẹp