650400/250 52.47-8.64+16.36-7.35 74000/125*8 以上是递等式计算，能巧则巧
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650400/250
= 650.4 x 1000 / 250
=650.4 x4
= 2601.6
52.47-8.64+16.36-7.35
52.47+16.36 - (8.64+7.35)
= 68.83-15.99
= 68.83-16+0.01
=52.84
74000/125*8
= 74000/ 1000
=74
= 650.4 x 1000 / 250
=650.4 x4
= 2601.6
52.47-8.64+16.36-7.35
52.47+16.36 - (8.64+7.35)
= 68.83-15.99
= 68.83-16+0.01
=52.84
74000/125*8
= 74000/ 1000
=74
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