用竖式计算.(带△的要验算)①△74.8÷0.22=△3.45×1.4=②1.296÷0.18=3

2025-01-01 16:14:24
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回答1:

①74.8÷0.22=340;
340
22 7480

66
88

88
0

验算:
340
× 0.22

.
680

680
74.80


3.45×1.4=4.83;
3.45
× 1.4

.
1380

345
4.830

验算:
1.4
× 3.45

.
70

56
42
4.830

②1.296÷0.18=7.2;
7.2
18 129.6

126
36

36
0


3.12×0.9≈2.8.
3.12
× 0.9

.
2.808


6.9÷0.54≈12.78.
12.777
54 690

54
150

108
420

378
420

378
420

378
42