(-2又4/5)×(-35)×(-3/7)计算过程如下:(-2又4/5)×(-35)×(-3/7)=14/5×35×(-3/7)=98×(-3/7)=14
原式=(-14/5)×(-35)×(-3/7)=-(14×35×3)/(5×7)=-(14×3)=-42