计算①25.3+(-7.3)+(-13.7)+7.3

1个回答

  • ①25.3+(-7.3)+(-13.7)+7.3=(25.3-13.7)+(-7.3+7.3)=11.6;

    ②(-5)×3÷(-0.5)=-15÷(-0.5)=30;

    ③-4.27+3.8-0.73+1.2=-(4.27+0.73)+(3.8+1.2)=-5+5=0;

    ④(1-[1/2]-[3/8]+[7/12])×(-24)=-24+12+9-14=-17;

    ⑤-10+(-12)÷(-4)=-10+3=-7;

    ⑥2×(-3)3-4×(-3)2+15=-2×27-4×9=-54-36=-90;

    ⑦(−2)2×(−2)3×(−

    3

    2)2÷(−1)101=4×(-8)×[9/4]÷(-1)=72;

    ⑧39

    55

    57÷(−20)=(40-[2/57])÷(-20)=-2+[1/570]=-1[569/570].