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ромашка261
@ромашка261
August 2022
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решите уравнения
x^2-4x+4=0
3x^2-12=0
x^2+9x+14=0
2x^2-14x-36=0
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Answers & Comments
mikael2
X^2-4x+4=0 (x-2)²=0 x=2
3x^2-12=0 x²=4 x1=2 x2=-2
x^2+9x+14=0 √D=√81-56=√
25=5
x1=1/2[-9-5]=-7 x2=1/2[-9+5]=-2
2x^2-14x-36=0 x
²-7x-18=0 √D=√49+72=√121=11
x1=1/2[7-11]=-2 x2=1/2[7+11]=9
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Answers & Comments
3x^2-12=0 x²=4 x1=2 x2=-2
x^2+9x+14=0 √D=√81-56=√25=5
x1=1/2[-9-5]=-7 x2=1/2[-9+5]=-2
2x^2-14x-36=0 x²-7x-18=0 √D=√49+72=√121=11
x1=1/2[7-11]=-2 x2=1/2[7+11]=9