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(1)(+12)-(-18)+(-7)-(+15)(1)解:原式=-9+5+12+(-3)(1)(-59)-(-46)+(-34)-(+73)(1)5.7-4.2-8.4-2.3+1=-59+46-34-73=5.7-4.2-8.4-2.3+1.2=-120=5.7+(-8.4-2.3)+(-4.2+1.2)=5.7+(-10.7)+(-3)(1)解:原式=(+4.3)+4+(-2.3)=-8;+(-4)=8.3+(-2.3)+(-4)=6+(-4)=2;2)解3+37124263.1=限2++1=.+2.1449三41134·
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