20-15.7+4.3怎样简算

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20-15.7+4.3怎样简算20-15.7+4.3怎样简算20-15.7+4.3怎样简算20-15.7+4.3将20换成15.7+4.315.7+4.3-15.7+4.3=8.6

20-15.7+4.3怎样简算
20-15.7+4.3怎样简算

20-15.7+4.3怎样简算
20-15.7+4.3
将20换成15.7+4.3
15.7+4.3-15.7+4.3
=8.6