(1)4.5×6.7
(2)6.8×4.3
(3)7.9×7.6
(4)19.4×6.1
(5)17.4×1.9
(6)4.7×4.5
(7)5.7×6.1
(8)6.2×19.5
(9)3.2×24.2
(10)4.6×7.3
(11)3.6×4.1
(12)2.6÷1.3
(13)1.6÷0.4
(14)5.2÷10.4
(15)4.2÷12.6
(16)3.1÷9.3
(17)20.4÷30.6
(18)43.5÷8.7
(19)26.7÷133.5
(20)32.1÷128.4
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