Ta có: \(B=\left(45\cdot1+912\right)\cdot37:\left(13\cdot74\right)\)
\(=\dfrac{37\left(45\cdot1+912\right)}{13\cdot74}\)
\(=\dfrac{45+912}{13\cdot2}\)
\(=\dfrac{957}{26}\)
(456\(\times\)11+912)\(\times\)37:(13\(\times\)74)
=5928\(\times37:\)962
=219336:962
=228