详细解答，请见下图：
1,
2.015+20.15+201.5+2015
=2.015X1+2.015X10+2.015X100+2.015X1000
=2.015X(1+10+100+1000
=2.015X1111
=2238.665
2,
3.75X4.23X36-125X0.423X2.8
=4.23X3.75X4X9-4.23X12.5X4X0.7
=4.23X15X9-4.23X50X0.7
=4.23X(135-35)
=4.23X100
=423
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