［(3又2/7-1.5)×1.12＋10又2/3］÷19/4
=［(23/7-3/2)×28/25＋32/3］×4/19
=［23/7×28/25-3/2×28/25＋32/3］×4/19
=［92/25-42/25＋32/3］×4/19
=［2＋32/3］×4/19
=［6/3＋32/3］×4/19
=38/3×4/19
=8/3
=2又2/3
5/21×2/7＋2又19/21×5/7＋(1-2/70)
=10/147+305/147+68/70
=315/147+34/35
=15/7+34/35
=75/35+34/35
=109//35
=3又4/35
2又4/5×0.6-2又1/4÷1又2/3＋0.55×2/5
=14/5×3/5-9/4×3/5+55/100×2/5
=42/25-27/20+11/25
=168/100-135/100+44/100
=67/100
=0.67