4×(-15)×(1/6-3/20+4/5-7/12)
=-60x(1/6-3/20+4/5-7/12)
=-60x1/6+60x3/20-60x4/5+60x7/12
=-10+9-48+35
=-144×(-15)×(-1/6-3/20+4/5-7/12)脱式计算怎样算？4×(-15)×(1/6-3/20+4/5-7/12)=-60x(1/6-3/20+4/5-7/12)=-60x1/6+60x3/20-60x4/5+60x7/12=-10+9-48+35=-14