50x+9999=50y
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a) A=-50x-50y=-50(x+y)=-50.4=-200
b)B=-34x+34y=-34(x-y)=-34.2=-68
a) A= -50x- 50y
= -50 (x+ y)
= -50. 4
= -200
b) B= -34x+ 34y
= -34( x-y)
= -34. 2
= -68
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f(x)= x^6 - 50x^5+50x^4-50x^3+50x^2-50x+50 tại x=49
<=> \(f_{\left(49\right)}\)= 49^6 - 50.49^5+50.49^4-50.49^3+50.49^2-50.49+50
<=> \(f_{\left(49\right)}\)= 13519544083, 0396489851
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\(x=49\Leftrightarrow50=x+1\)
Tính A = x7 - 50x6 + 50x5 - 50x4 + 50x3 - 50x2 +50x +100 với x = 49
\(\Rightarrow A=x^7-\left(x+1\right)x^6+\left(x+1\right)x^5-\left(x+1\right)x^4+\left(x+1\right)x^3-\left(x+1\right)x^2+\left(x+1\right)x+100\)
\(=x^7-\left(x^7+x^6\right)+\left(x^6+x^5\right)-\left(x^5+x^4\right)+...+\left(x^2+1\right)+100\)
\(=x+100=149\)
50x+9999=50y
=> 9999=50y-50x
=> 9999=50(y-50x-1)
=> y-50x-1=199,98