0.625×6又1/3+5/8×一又2/3
=5/8×6又1/3+5/8×1又2/3
=5/8×(6又1/3+1又2/3)
=5/8×8
=5
4/5÷7/4+2/5×4/7
=4/5×4/7+2/5×4/7
=(4/5+2/5)×4/7
=6/5×4/7
=24/35