15.52-1.6X5-5.7=

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15.52-1.6X5-5.7=15.52-1.6X5-5.7=15.52-1.6X5-5.7=15.52-1.6x5-5.7=15.52-8-5.7=15.52-（8+5.7）=15.52-13.7

15.52-1.6X5-5.7=
15.52-1.6X5-5.7=

15.52-1.6X5-5.7=
15.52-1.6x5-5.7
=15.52-8-5.7
=15.52-（8+5.7）
=15.52-13.7
=1.82

15.52-1.6x5-5.7
=15.52-8-5.7
=15.52-（8+5.7）
=15.52-13.7
=1.82