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Sagot :
Answer:
81
=
9
⋅
9
then the square root of
√
81
=
9
.
Because the double multiplication for the same sign is always positive, the square root is also valid with the other sign
81
=
(
−
9
)
⋅
(
−
9
)
then
√
81
=
−
9
and we can say that
√
81
=
±
9
.
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