1)原式=3.64×0.25+4.36×0.25
=(3.64+4.36)×0.25
=8×0.25
=2×4×0.25
=2×1
=2
2)原式=1.05×3÷6.3
=1.05×3÷2.1÷3
=(1.05÷2.1)×(3÷3)
=0.5×1
=0.5
3)原式=(1/2+1/3)×5/3-17/18
=5/6×5/3-17/18
=25/18-17/18
=8/18
=4/9
4)原式=(1-3/10)÷5/8
=7/10×8/5
=28/25