3/5÷[7/8-(2/5+3/8)]-(4/5-1/4)* 6/11÷9/20

问题描述:

3/5÷[7/8-(2/5+3/8)]-(4/5-1/4)* 6/11÷9/20

3/5÷[7/8-(2/5+3/8)]-(4/5-1/4)* 6/11÷9/20
=3/5÷(7/8-3/8-2/5)-(16/20-5/20)x6/11x20/9
=0.6÷(0.5-0.4)-11/20x6/11x20/9
=0.6÷0.1-6/9
=6-2/3
=5又 1/3