1. 计算下面各题。
(1) $1.8 + 1.9 + 1.7$
(2) $2.1 + 2.2 + 2.3$
(3) $19.8 + 29.8 + 39.7$
(4) $30.2 + 40.1 + 50.3$
(5) $86.28 - 69.4 - 9.9$
(6) $106.28 - 69.98 - 19.8$
(1) $1.8 + 1.9 + 1.7$
(2) $2.1 + 2.2 + 2.3$
(3) $19.8 + 29.8 + 39.7$
(4) $30.2 + 40.1 + 50.3$
(5) $86.28 - 69.4 - 9.9$
(6) $106.28 - 69.98 - 19.8$
答案
1.(1)5.4 (2)6.6 (3)89.3 (4)120.6 (5)6.98 (6)16.5
2. 计算下面各题。
(1) 21.9+15.03+4.97+8.1
(2) 3.66+6.44+6.34
(3) 91.08+9.2+0.8+8.92
(4) 0.96+8.4+9.04+1.6
(5) 214.04-55.15-14.04
(6) 504.9-15.9-104.9
(1) 21.9+15.03+4.97+8.1
(2) 3.66+6.44+6.34
(3) 91.08+9.2+0.8+8.92
(4) 0.96+8.4+9.04+1.6
(5) 214.04-55.15-14.04
(6) 504.9-15.9-104.9
答案
2.(1)50 (2)16.44 (3)110 (4)20 (5)144.85 (6)384.1
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