一个是1.35*4.2*0.8,另一个是0.074*1.8*20.5,重谢

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一个是1.35*4.2*0.8,另一个是0.074*1.8*20.5,重谢一个是1.35*4.2*0.8,另一个是0.074*1.8*20.5,重谢一个是1.35*4.2*0.8,另一个是0.074*

一个是1.35*4.2*0.8,另一个是0.074*1.8*20.5,重谢
一个是1.35*4.2*0.8,另一个是0.074*1.8*20.5,重谢

一个是1.35*4.2*0.8,另一个是0.074*1.8*20.5,重谢
1.35*4.2*0.8=(1.25+0.1)*4.2*0.8=1.25*4.2*0.8+0.1*4.2*0.8=4.2+0.336=4.536
0.074*1.8*20.5=0.074*1.8*(20+0.5)=0.074*1.8*20+0.074*1.8*0.5=0.075*1.8*20-0.001*1.8*20+0.074*0.9=2.7-0.036+0.0666=2.7306

1.35*4.2*0.8
=(1.25+0.1)*4.2*0.8
=1.25*0.8*4.2+0.1*0.8*(4+0.2)
=4.2+(0.32+0.016)
=4.2+0.336
=4.536
0.074*1.8*20.5
=0.074*1.8*(20+0.5)
=0.074*1.8*20+0.074*1.8*0.5
=(0.075-0.001)*36+0.074*0.9
=0.075*36-0.001*36+0.074*0.9
=2.7-0.036+0.0666=2.7306

1.35*4.2*0.8=4.536 & 0.074*1.8*20.5=2.7306