Root over (7-1)²+(7-y)²=10
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7−2
10
=5+2−2
10
=(
5
)
2
+(
2
)
2
−2(
5
)(
2
)
7−2
10
=(
5
−
2
)
2
7−2
10
=
5
−
2
10
=5+2−2
10
=(
5
)
2
+(
2
)
2
−2(
5
)(
2
)
7−2
10
=(
5
−
2
)
2
7−2
10
=
5
−
2
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