Question

-2（+7/12)+(-7/15)-(-1/3)+(-1又1/6)= (-47/8)-(5又1/5

Answer 1

问：-2（+7/12)+(-7/15)-(-1/3)+(-1又1/6)= (-47/8)-(5又1/5)+(4又1/4)-(+3又1/8)= (-1)+(+2)-(-3)-(-4)=

答：-2（+7/12)+(-7/15)-(-1/3)+(-1又1/6)= (-47/8)-(5又1/5)+(4又1/4)-(+3又1/8)= (-1)+(+2)-(-3)-(-4)=-5/6

答：能否把原题拍给我看一下呢

答：2/7×（-5/12）-5/7×5/12-5/3×1/4=2/7×（-5/12）-5/7×5/12-5/12 (将5/3*1/4算出来，恰好为5/12)=-2/7×5/12-5/7×5/12-5/12 (改变第一部分中的符号，变出5/12）=5/12*(-2/7-5/7-1) (提取5/12)=5/12*(-2)=-5/6