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bakulinnikitos
@bakulinnikitos
August 2021
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Решите задания с картинки плиз!!! Даю много баллов!!!
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nafanya2014
Verified answer
K²+5x+64x²= (k+8x)²
k²+5x+64x²=k² +2*k*8x +(8x)^2
16k=5
k=5/16
k²=25/256
2.
((9/10)-(1/4)t⁶)²=(9/10)²-2·(9/10)·(1/4)·t⁶+(1/4)²·(t⁶)²=
=(1/16)t¹²-(9/20)t⁶+(81/100)
3.
По формуле a²-b²=(a-b)(a+b)
a=c+20d
b=20c+d
(c+20d)²-(20c+d)²=(c+20d-20c-d)(c+20d+20c+d)=(19d-19c)(21c+21d)=
=19·21(d²-c²)=399(d²-c²)
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Answers & Comments
Verified answer
K²+5x+64x²= (k+8x)²k²+5x+64x²=k² +2*k*8x +(8x)^2
16k=5
k=5/16
k²=25/256
2.
((9/10)-(1/4)t⁶)²=(9/10)²-2·(9/10)·(1/4)·t⁶+(1/4)²·(t⁶)²=
=(1/16)t¹²-(9/20)t⁶+(81/100)
3.
По формуле a²-b²=(a-b)(a+b)
a=c+20d
b=20c+d
(c+20d)²-(20c+d)²=(c+20d-20c-d)(c+20d+20c+d)=(19d-19c)(21c+21d)=
=19·21(d²-c²)=399(d²-c²)