(1)4.2×(6.18-3.03)
=4.2×3.15
=13.23
(2)4.5÷1.8
=4.5÷(9×0.2)
=4.5÷9÷0.2
=0.5÷0.2
=2.5
(3)5.4×12-5.4-5.4
=5.4×(12-1-1)
=5.4×10
=54
(4)(6.02+2.8)÷0.4-2.05
=8.82÷0.4-2.05
=22.05-2.05
=20
(5)15.02-6.8-(1.02+1.2)
=15.02-6.8-1.02-1.2
=(15.02-1.02)-(6.8+1.2)
=14-8
=6
(6)3.08×3.5+6.2×3.08+3.08×0.3
=3.08×(3.5+6.2+0.3)
=3.08×10
=30.8