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ccterpaan
@ccterpaan
September 2021
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как посчитать помогите пожалуйста
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yarovoe
√(49-14х+х²)=√(x-7)²=lx-7l=x-7 при х>7
x²(x-5)-(x-5)=(x-5)(x²-1)=(x-5)(x-1)(x+1)=0
x₁=-1,x₂=1,x₃=5
(2+√5)²·(9-4√5)=(4+4√5+5)(9-4√5)=(9+4√5)(9-4√5)=9²-(4√5)²=81-80=1
1 votes
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ccterpaan
ага спасибо но я уже решил ^_^
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Answers & Comments
x²(x-5)-(x-5)=(x-5)(x²-1)=(x-5)(x-1)(x+1)=0
x₁=-1,x₂=1,x₃=5
(2+√5)²·(9-4√5)=(4+4√5+5)(9-4√5)=(9+4√5)(9-4√5)=9²-(4√5)²=81-80=1