Question

With solution.........
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Answer 1

Step-by-step explanation:

10/20+4/8-9/18

=1/2+1/2-1/2

=1/2

now what should be added to

1/2 to get 1

1-1/2 = 1/2 (ans)

Answer 2

Step-by-step explanation:

$firstly \: cut \: them \: with \: their \: numbers \\ 1 \div 2 + 1 \div 2 - 1 \div 2 \\ we \: know \: half \: add \: half \: i \: 1 \\ 1 - (1 \div 2) \\ 1 \div 2$

hope it helps u

thanks