2又2/5乘1/3-1/2的差乘3/11除以1又1/4?解:(2又2/5×1/3-1/2)×3/11÷1又1/4=(4/5-1/2)×3/11÷1又1/4=3/10×3/11÷1又1/4=9/110÷1又1/4=18/275
(2又2/5×1/3-1/2)×3/11÷1又1/4=(12/5×1/3-1/2)×3/11÷5/4=(4/5-1/2)×3/11×4/5=3/10×3/11×4/5=18/275