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Brollins
@Brollins
July 2022
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Помогите решить уравнения: 13x^2+15x+2=0 , 5x^2-12x+7=0, 3x^2+10x-25=0 , 3x^2-7x+2=0 , 7x^2-10x-8=0
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master200481
13х^2+15х+2=0 5x^2-12x+7=0
D=225-104=121(11^2) D=144-140=4(2^2)
x1 =-15+11/26=-2/13 x1 =12-2/10=1
x2=-15-11/26=-1; x2=12+2/10=1,4
3x^2+10x-25=0 3x^2-7x+2=0
D=100+300=400(20^2) D=49-24=25(5^2)
x1 =-10-20/6=-5 x1 =7+5/6=2
x2 =-10+20/6=10/6=1 2/3 x2 =7-5/6=1/3
7x^2-10x-8=0
D=100+224=324(18^2)
x1 =10+18/14=2
x2 =10-18/14=-4/7
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master200481
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Answers & Comments
D=225-104=121(11^2) D=144-140=4(2^2)
x1 =-15+11/26=-2/13 x1 =12-2/10=1
x2=-15-11/26=-1; x2=12+2/10=1,4
3x^2+10x-25=0 3x^2-7x+2=0
D=100+300=400(20^2) D=49-24=25(5^2)
x1 =-10-20/6=-5 x1 =7+5/6=2
x2 =-10+20/6=10/6=1 2/3 x2 =7-5/6=1/3
7x^2-10x-8=0
D=100+224=324(18^2)
x1 =10+18/14=2
x2 =10-18/14=-4/7