=10.09+7.27-3.52-3.36-4.48
=17.54-3.52-3.36-4.48
=14.02-3.36-4.48
=10.66-4.48
=6.18
5.73+4.36+7.27-3.52-3.36-4.48
=5.73+7.27+4.36-3.36-（3.52+4.48）
=13+1-8
=6
5.73+4.36+7.27-3.52-3.36-4.48用简便方法计算
=5.73+7.27+4.36-3.36-(3.52+4.48)
=13+1-8
=14-8
=6
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