(1)384.2-4.29=379.91
3 8 4.2
?
4.2 9
3 7 9.9 1
验算:
3 7 9.9 1
+
4.2 9
3 8 4.2 0
(2)8.4×0.075=0.63.
0.0 7 5
×
8.4
3 0 0
6 0 0 0.6 3 0 0
(3)87÷0.06=1450
验算:
1 4 5 0
×
0.0 6
8 7.0 0
(4)65.5×0.345≈22.60
6 5.5
×
0.3 4 5
3 2 7 5
2 6 2 0
1 9 6 5 2 2.5 9 7 5
(5)2.06×0.87=1.7922
2.0 6
×
0.8 7
1 4 4 2
1 6 4 8 1.7 9 2 2
验算: