(3/4-4/5)×7,8-(2/3+4/7)×(-7/13)

Question

(3/4-4/5)×7,8-(2/3+4/7)×(-7/13)

Answer 1

1.  3/4-4/5=-1/20
2.  -1/20*7.8=-1/20*78/10=-39/100
3.  2/3+4/7=26/21
4.  26/21*(-7/13)=-7/42=-1/6
5.  -39/100-(-1/6)=-6*39+100/600=-134/600=-67/300

Comments

спс

---

спас

---

ла