(3.91+3又3/7+6.09+6又4/7)*(2又1/8-1.125)

问题描述:

(3.91+3又3/7+6.09+6又4/7)*(2又1/8-1.125)

(3.91+3又3/7+6.09+6又4/7)*(2又1/8-1.125)
=(3.91+24/7+6.09+46/7)*(17/8-9/8)
=(10+10)*1
=20