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Melanie1235
@Melanie1235
June 2022
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Вариант 4 номера 3 и 5
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elviraletkovskp3a6zc
3а)
х^2+(5-x)(5+x)=100x
x^2+25-x^2=100x
25=100x
x=1/4
3б)
(4x+1)^2-16(x+2)(x-2)=17
16x^2+8x+1-16x^2+64=17
8x=-48
x=-6
5.
31,4^2-31,3^2=(31,4-31,3)(31,4+31,3)=0,1*62,7=6,27
Все решения основаны на формулах сокращенного умножения
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Answers & Comments
х^2+(5-x)(5+x)=100x
x^2+25-x^2=100x
25=100x
x=1/4
3б)
(4x+1)^2-16(x+2)(x-2)=17
16x^2+8x+1-16x^2+64=17
8x=-48
x=-6
5.
31,4^2-31,3^2=(31,4-31,3)(31,4+31,3)=0,1*62,7=6,27
Все решения основаны на формулах сокращенного умножения