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Question

Multiplicative inverse of 

1) -7/9

2) 13/15

3) 1/3×4/7

4) -13/11×1/5


Solution

If a is the no., then it's multiplicative inverse is 1/a (as a*1/a =1)
So multiplicative inverses are
1)a=-7/9
1/a=-9/7
2)a=13/15
=>1/a=15/13
3)a=1*4/3*7=4/21
1/a=21/4
4)
a=-13*1/11*5=-13/55
1/a=-55/13

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