如题所述
18.3-4.27-5.73+12.7æä¹ç®ä¾¿è®¡ç®
18.3-4.27-5.73+12.7
=(18.3+12.7)-(4.27+5.73)
=31-10
=21
18.3-4.27-5.73+12.7
=(18.3+12.7)-(4.27+5.73)
=31-10
=21
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第1个回答 2016-06-27
原试=(18.3+12.7)-(4.27+5.73)=31-10=21