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44x20竖式计算并验算

440x^2+880x=192.5 x^2+2x-0.4375=023/8 x^2+2x+1-1-0.4375=0 (x+1)^2=1.4375 x+1=±√1.4375 x=±√1.4375-1 x=±√23/4 - 1

18x20=360,竖式如图:

30*20=600

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

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

44x45怎么列竖式计算?44*45=1980

738÷20=36.9列竖式如下

100

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.

96÷20=4.8 竖式过程为

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