(5又5/9)×2/3 - 7/18× 3/4
=(50/9)×2/3 - 7/24
=100/27 - 7/24
=(2400-169)/(27×24)
=2231/648
8/15÷(-0.32)×(-1又1/5)
=(8/15)÷(-8/25)×(-6/5)
=(8/15)× (-25/8)×(-6/5)
=2
(5又5/9)×2/3 - 7/18× 3/4
=(50/9)×2/3 - 7/24
=100/27 - 7/24
=(2400-169)/(27×24)
=2231/648
8/15÷(-0.32)×(-1又1/5)
=(8/15)÷(-8/25)×(-6/5)
=(8/15)× (-25/8)×(-6/5)
=2