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].