(1)3.2×0.2 1.4×0.4 3.3÷3 1.2÷0.3
(2)2.5×0.4 1.5×2 0.7×7 7.3+0.3
(3)0.53-0.3 1.8×0.5 0.9×0.01 0.23×3
(4)0.56÷8 1.23×3 1.6÷0.04 7.3+2.7
(5)2-1.2 7.8÷6 8.4÷0.21 8.4÷0.7
(6)5.6+3.6 9-2.35 0.56÷8 1.23×3
(7)5.6÷0.4 4.5÷0.9 8.1×2 90÷3
(8)1.23+3 5.6+1.23 4.5×2 5.6÷1.4
(9)4.8÷1.2 7.2÷0.9 6.6÷1.1 7.2÷6
(10)2.1÷3 0.6×0.5 3.23×2 1.8÷3
(11)12.5÷0.1 0.32÷0.8 1.6+3.7 0.45×0.2
(12)0.36÷1.8 0.4×0.5 8.4+5.6 8.4÷2.1
(13)4.8÷0.08 4.8÷0.8 3+2.3 9.3÷3
(14)0.01×8 7.31×100 0.09×6 0.8×0.6
(15)1.25×8 3÷5 2.3+2.3 6.23+3.6.