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Viktoria818
@Viktoria818
August 2022
1
9
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1. Вычислите.
0,757в квадрате - 0,243 в квадрате
2.Решите уравнение.
1/9х в квадрате -9=0
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isaevaelenka
0,757²-0,243²=(0,757-0,243)(0,757+0,243)=0,514*1=0,514
1/9х²-9=0
(1/3х-3)(1/3х+3)=0
1. 1/3х-3=0
1/3х=3
х=3:1/3
х=9
2. 1/3х+3=0
1/3х= - 3
х= -3:1/3
х= - 9
Ответ: х₁=9; х₂= - 9
2 votes
Thanks 1
Viktoria818
Спасибо, Вы мне очень помогли!
isaevaelenka
всегда пожалуйста
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Answers & Comments
1/9х²-9=0
(1/3х-3)(1/3х+3)=0
1. 1/3х-3=0
1/3х=3
х=3:1/3
х=9
2. 1/3х+3=0
1/3х= - 3
х= -3:1/3
х= - 9
Ответ: х₁=9; х₂= - 9