Сократите дробь.1) 41*42 ----------- = 35*112) 21*22 ------- = 55*633)56*15 ----------...

Question

Сократите дробь.
1) 41*42
----------- =
35*11

2) 21*22
------- =
55*63

3)56*15
---------- =
18*64

4) 15*40
---------- =
45*63

Answer 1

1) 41*42        41*6*7       41*6
  ----------- =  ------------- = ----------
  35*11          5*7*11      5*11

Comments

2) 21*22
------- = (7*3*2*11)/(5*11*3*3*7)=2/(5*3)
55*63

---

3)56*15
---------- =(7*8*3*5)/(3*3*2*8*8)=(7*5)/(3*2*8)
18*64

---

4) 15*40
---------- =(3*5*5*8)/(3*3*5*9*7)=(5*8)/(3*9*7)
45*63