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yuliyamalyuk090
@yuliyamalyuk090
July 2022
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решите уравнения. помогите пожалуйста :)
1) (x+4)^2-(×-2)(×+2)=0
2)(2×-5)^2-(2×-3)(2×+3)=0
3)(3×+5)(3×-5)-(3×-1)^2=10
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m11m
1) (х+4)²-(х-2)(х+2)=0
х²+8х+16-х²+4=0
8х=-20
х=-20 : 8
х=-2,5
Ответ: -2,5.
2) (2х-5)²-(2х-3)(2х+3)=0
4х²-20х+25-4х²+9=0
-20х=-34
х=-34 : (-20)
х=1,7
Ответ: 1,7
3) (3х+5)(3х-5)-(3х-1)²=10
9х²-25-9х²+6х-1=10
6х=10+26
6х=36
х=6
Ответ: 6.
1 votes
Thanks 1
yuliyamalyuk090
Большое Спасибо, но я уже их сама решила )
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Answers & Comments
х²+8х+16-х²+4=0
8х=-20
х=-20 : 8
х=-2,5
Ответ: -2,5.
2) (2х-5)²-(2х-3)(2х+3)=0
4х²-20х+25-4х²+9=0
-20х=-34
х=-34 : (-20)
х=1,7
Ответ: 1,7
3) (3х+5)(3х-5)-(3х-1)²=10
9х²-25-9х²+6х-1=10
6х=10+26
6х=36
х=6
Ответ: 6.