28.71-7.29+2.29-2.71怎样简算

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28.71-7.29+2.29-2.71怎样简算
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28.71-7.29+2.29-2.71怎样简算
28.71-7.29+2.29-2.71怎样简算

28.71-7.29+2.29-2.71怎样简算
(28.71+2.29)-(7.29+2.71)=31-10=21

28.71+2.29-(7.29+2.71)=21

(28.71-2.71)-(7.29-2.29)

(28.71-2.71)-(7.29-2.29)=26-5=21