Question

20.5×8.1+20×1.25+405×0.19怎么简便计算？

Answer 1

20.5×8.1+20×1.25+405×0.19
=（20.5×8.1）+（20×1.25）+（405×0.19）
=180.4+25+76.95
=282.35

Answer 2

每个因数里都有5，先把5拿出来，算式变成：5（4.1*8.1+4*1.25+81*0.19）=5*4.1*8.1+25+5*81*0.19=5*8.1（4.1+1.9）+25=5*8.1*6+25=30*8.1+25=243+25=268

Answer 3

20.5×8.1+20×1.25+405×0.19
=20.5×8.1+8.1×5×1.9+20×1.25
=8.1×（20.5+9.5）+20×1.25
=8.1×30+20×1.25
=8.1×30+20×5/4
=243+25
=268

Answer 4

20.5×8.1+20×1.25+405×0.19
=205x0.81+25+205x0.19+200x0.19
=205x（0.81+0.19）+25+38
=205x1+25+38
=230+38
=268

Answer 5

这条问题对应的回答是
等于166.05+25+76.95=268
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