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14x20用竖式计算并验算

30 * 8 ---- 240 对着0

①925÷25=37; 3 7 25 9 2 5 7 5 1 7 5 1 7 5 0 ②425*32=13600; 4 2 5 * 3 2 . 8 5 0 1 2 7 5 1 3 6 0 0 ③11.36+8.54=19.9. 1 1.3 6 + 8.5 4 . 1 9.9 0 验算: 1 9.9 0 ? 8.5 4 . 1 1.3 6

132*64=8448; 132 *64 528 792 8448 ; 28.56-14.76=13.8; 28.56 ?14.76 13.80 .

48.5+47.25=95.75; 48.5+47.25 95.75 ;验算: 47.25+48.5 95.75 ;20.8-6.48=14.32; 20.8?6.48 14.32 ;验算: 14.32+6.48 20.80 ;故答案为:95.75,14.32.

18x20=360,竖式如图:

(1) 335 - 210 125 验算:125+210=335 (2) 704 + 198 902 验算:902-704=198 (3) 450 * 8 3600 验算:3600÷8= 450 (4) 1051 * 7 7357 验算:7357÷7=1051

19.08+5.83=24.91验算:20-3.18=16.82验算:

16.78+3.45=(用竖式计算并验算) 16.78+3.45=20.23 验算:

100

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