Question

3/7+х=1, 2/8+х=1, 3/10+х=1, 19/100+х=1

Answer 1

3/7+х=1
х=1-3/7
х=7/7-3/7
х=4/7

2/8+х=1
х=1-2/8
х=6/8
х=3/4

3/10+х=1
х=1-3/10
х=7/10

19/100+х=1
х=1-19/100
х=100/100-19/100
х=81/100