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Valeri7a
@Valeri7a
July 2022
1
3
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Найдите значение выражения: (0.8x−4 y) : (0.2x²−5y²), если x+5y=4.
Варианты ответов:
0,25
1
-4
-1
0,1
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Answers & Comments
ник3709
(0,8x-4y)÷(0,2x^2-5y^2)=
=0,8(x-5y):0,2(x^2-25y^2)=
=0,8(x-5y):0,2(x-5y)(x+5y)=
=4÷(x + 5y)=4÷4=1.
3 votes
Thanks 3
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Answers & Comments
=0,8(x-5y):0,2(x^2-25y^2)=
=0,8(x-5y):0,2(x-5y)(x+5y)=
=4÷(x + 5y)=4÷4=1.