(1)4.5+0.45=4.95;
(2)3.8-0.38=3.42;
(3)0.4÷0.004=100;
(4)0.15×0.04=0.006;
(5)
+4 7
+4 9
,3 7
=(
+4 7
)+3 7
,4 9
=1+
,4 9
=1
;4 9
(6)
×5 3
÷1 4
,5 3
=
×5 3
×1 4
,3 5
=
;1 4
(7)7.7×
-2.9,4 7
=4.4-2.9,
=1.5;
(8)1000×
=125.1 8