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nati0298
@nati0298
July 2022
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Alexandr130398
AC=4.8
sinA=7/25=CB/AB ⇒CB=7x; AB=25x
AB²-CB²=AC²
(25x)²-(7х)²=4,8²
625х²-49х²=23,04
576х²=23,04
х²=23,04/576=0,04
х=0,2
АВ=25х=25*0,2=5
отв:5
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Answers & Comments
sinA=7/25=CB/AB ⇒CB=7x; AB=25x
AB²-CB²=AC²
(25x)²-(7х)²=4,8²
625х²-49х²=23,04
576х²=23,04
х²=23,04/576=0,04
х=0,2
АВ=25х=25*0,2=5
отв:5