负4.2+5.7减8.4+10

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负4.2+5.7减8.4+10负4.2+5.7减8.4+10负4.2+5.7减8.4+10-4.2+5.7-8.4+10=-(4.2+8.4)+(5.7+10)=15.7-12.6=3.1

负4.2+5.7减8.4+10
负4.2+5.7减8.4+10

负4.2+5.7减8.4+10
-4.2+5.7-8.4+10 =-(4.2+8.4)+(5.7+10) =15.7-12.6 =3.1