4/5×3 7/9÷2 3/7×5 7/8÷6 5/4
4/5*3 7/9=4/5*34/9=136/45
136/45:2 3/7=136/45*7/17=56/45
56/45*5 7/8=56/46*47/8=329/46
329/46:6 5/4=329/46*4/29=1316/1334=658/667
4/5×3 7/9÷2 3/7×5 7/8÷6 5/4
4/5*3 7/9=4/5*34/9=136/45
136/45:2 3/7=136/45*7/17=56/45
56/45*5 7/8=56/46*47/8=329/46
329/46:6 5/4=329/46*4/29=1316/1334=658/667