see
5分之6Ⅹ8分之3十8分之5÷6分之5=6/5x3/8+5/8x6/5=6/5x(3/8+5/8)=6/5x1=6/5
1、=5-19/24=101/24 2、=2/5+3/5+5/11-4/11=1又1/11 3、=11/9-2/2-17/20=3/20 4、=9/7-2/7+1/8+3/8=1又1/2
6/5×3/8+5/8×6/5=9/20+3/4=24/20=6/5
