Resposta:
D²=a²+b²+c²
(3_/10)²=4²+7²+x²
9.10=16+49+x²
90=65+x²
65-90=x²
-25=x²
x=_/-25
x=5
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Resposta:
D²=a²+b²+c²
(3_/10)²=4²+7²+x²
9.10=16+49+x²
90=65+x²
65-90=x²
-25=x²
x=_/-25
x=5