问题
解答题
|
答案
42.8+85.42=128.22;
+42. 8 85. 42
----------
128.22
验算:
-128 .22 85 .42
-----------
42.8 0
0.98÷2.8=0.35;
0.35
2.8 0.98
84
------------
140
140
--------------
0
验算:
0. 35 × 2.8
---------
280
7 0
----------
0.980
5.4×3.1=16.74;
×5. 4 3. 1
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5 4
16 2
------------
16.7 4
验算:
5.4
3.1 16.74
15 5
----------
1 2 4
1 2 4
----------
0.