Ex 71
a)
3* 7/5
= 21/5
b)
8/7*2
= 16/7
c)
-5*4/3
=-20/3
d)
6*-3/11
=-18/11
72
5/7*2/3= 10/21
9/11*8/7= 72/77
45/7*2/9= 90/63
6/7*1/13= 6/91
73
15/8*1/5
=(15*1)/(8*5)
=(5*3)/(8*5)
=3/8
9/17*34/5
=(9*34)/(17*5)
=(9*17*2)/(17*5)
=18/5
2/7*9/8
=(2*9)/(7*8)
=(2*9)/(7*2*4)
=9/28
8*7/64
=(8*7)/(8*8)
= 7