56×（3/7- 3/8）/W:R7U:G*k9[9?1x
算式：提示+W)o+G4a5}1a9W/W:R7U:G*k9[9?1x
=2f+w1^.O({+k(l3^9k-Z2h(`1M1W-E*{,b.\-\/D/V/W:R7U:G*k9[9?1x