用竖式计算.(①②题要验算,⑤⑥题得数保留两位小数)
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(1)2.9×8.1=23.49;
2.9 × 8.1
. 2 9
2 3 2 2 3.4 9
验算:
8.1 × 2.9
. 7 2 9
1 6 2 2 3.4 9
(2)0.756÷0.18=4.2;
4.2 18 7 5.6
7 2 3 6
3 6 0
验算:
0.1 8 × 4.2
. 3 6
7 2 0.7 5 6
(3)0.48×2.5=1.2;
0.4 8 × 2.5
. 2 4 0
9 6 1.2 0 0
(4)36÷50=0.72;
0.7 2 50 3 6 0
3 5 0 1 0 0
1 0 0 0
(5)5.05×4.9≈24.75;
5.0 5 × 4.9
. 4 5 4 5
2 0 2 0 2 4.7 4 5
(6)4.28÷3.5≈1.22.
1.2 2 2 35 4 2.8
3 5 7 8
7 0 8 0
7 0 1 0 0
7 0 3 0