Question

小学奥数题求简便方法运算

41.2x8.1+11x9.25+537x0.19=？

Answer 1

我的解法：
41.2*8.1+11*9.25+537*0.19
=41.2*8.1+53.7*1.9+11*9.25
=41.2*（10-1.9）+53.7*1.9+11*9.25
=41.2*10-（41.2-53.7）*1.9+11*9.25
=412+12.5*1.9+11*9.25
=412+（1.1+0.8）*12.5+1.1*92.5
=412+10+（12.5+92.5）*1.1
=422+（100+5）*1.1
=422+110+5.5
=537.5

Answer 2

我试试
41.2*8.1+11*9.25+537*0.19
=41.2*（10-1.9）+11*（10-0.75）+53.7*1.9
=412-41.2*1.9+110-11*0.75+53.7*1.9
=412+110+（-41.2+53.7）*1.9-11*0.75
=412+110+12.5*1.9-1.1*7.5
=522+12.5*（0.8+1.1）-1.1*7.5
=522+12.5*0.8+12.5*1.1-7.5*1.1
=522+10+（12.5-7.5）*1.1
=522+10+5.5
=537.5

Answer 3

我的解法：
41.2*8.1+11*9.25+537*0.19 =537.5

Answer 4

537.5

Answer 5

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