1.(-2.5)+(-5.9) = -8.42.1.9+6= 7.93.(-4.2)+(-8.4)+5.7+10 =(-12.6)+10= -2.64.(-3.7)+(-4.9)+6.1+1.8 =(-8.6)+7.9 =-0.75.1/3-2/3+1 =1/3+1-2/3 = 2/36.(-1/4)+5/6+2/3-1/2 =(-1/4)+(-1/2)+5/6+2/3 =(-3/4)+9/租敬拆6 =3/47.-36-25-36+72 =-97+72 =-258.-8+3+5-9 =-17+8 =-99.-5-9+3=-1110.-5-9+3=-1111.-3-4+19-11=112.-8+12-16-23=-35祝稿团：学习进步弊枣！
标签：加减法,有理数,初一
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