rationalize denominator of 1 by root 7 minus 2
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1/7-2×7+2/7+2
=7+2/7^2-2^2
=9/49-4
=9/45
=1/5
=7+2/7^2-2^2
=9/49-4
=9/45
=1/5
Answered by
6
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