prosze o dobrze rozwiazane zadania dzieki
1)
w(x) x^3 - ax^2 + 3x + b , F(2) = 3 ,F(-1) = -6 ? jezlei chodzi o W(2)=3 to mamy taK:
W(2) = 2^3 - a*2^2 + 3*2 + b
3 = 8 - 4a + 6 + b
4a - b = 11
W(-1) = (-1)^3 - a(-1)^2 +3*(-1) + b
-6 = -1 - a -3 +b
a-b=2
4 a - b = 11 => 4a - b = 11 => 3a = 9
a - b = 2 /*(-1) -a + b = -2 a=3
-3 + b = -2 => b = 1
2) 2x^3 - 8x^2 - 3x + 12 = 2x^2 ( x -4 ) - 3 ( x - 4 ) = ( x- 4 ) ( 2x^2 - 3 ) = 2(x-4)(x^2-3/2)
p{x} pierwistek z x , p{3/2} = p{3} / p{2} = p{3} * p { 2 } / 2 = p{6} / 2
= 2 ( x - 4 ) ( x - p{6}/2 ) ( x + p{6}/2 )
3) a3 =11
a8 = 31
a8 = a3 + ( 8 - 3 - 1 ) r
a8 = a3 + 4r =31
11 +4r = 31
4r= 20 => r= 5
= a1 + (3 -1)r = a1 + 2r
a1= a3 - 2r
a1 = 11 - 10 = 1
S10 = (a1 + a10) / 2 * 10 = 5(a1 + a10) = 5(a1 + a8 + 2r ) = 5( 1 + 31 + 10) = 5*42 = 210
4) tg alfa = dlugosc przyprostokatnej lezącej naprzeciw kata / dlugosci przyprostokatnej lezacej przy kacie
tg a = 1/4
1/4 = x/12 x=3
5) wiekszy kąt lezy naprzeciw wiekszego boku czyli 6 ( bo 6^2 = 36 > 2p{7}^2 = 4*7=28 )
c^2 = a^2 + b^2
c^2 = 6^2 + (2p{7})^2
c^2 = 36 + 28 = 64 => c=8
sin a = a/c = 6/8 = 3/4
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1)
w(x) x^3 - ax^2 + 3x + b , F(2) = 3 ,F(-1) = -6 ? jezlei chodzi o W(2)=3 to mamy taK:
W(2) = 2^3 - a*2^2 + 3*2 + b
3 = 8 - 4a + 6 + b
4a - b = 11
W(-1) = (-1)^3 - a(-1)^2 +3*(-1) + b
-6 = -1 - a -3 +b
a-b=2
4 a - b = 11 => 4a - b = 11 => 3a = 9
a - b = 2 /*(-1) -a + b = -2 a=3
-3 + b = -2 => b = 1
2) 2x^3 - 8x^2 - 3x + 12 = 2x^2 ( x -4 ) - 3 ( x - 4 ) = ( x- 4 ) ( 2x^2 - 3 ) = 2(x-4)(x^2-3/2)
p{x} pierwistek z x , p{3/2} = p{3} / p{2} = p{3} * p { 2 } / 2 = p{6} / 2
= 2 ( x - 4 ) ( x - p{6}/2 ) ( x + p{6}/2 )
3) a3 =11
a8 = 31
a8 = a3 + ( 8 - 3 - 1 ) r
a8 = a3 + 4r =31
11 +4r = 31
4r= 20 => r= 5
= a1 + (3 -1)r = a1 + 2r
a1= a3 - 2r
a1 = 11 - 10 = 1
S10 = (a1 + a10) / 2 * 10 = 5(a1 + a10) = 5(a1 + a8 + 2r ) = 5( 1 + 31 + 10) = 5*42 = 210
4) tg alfa = dlugosc przyprostokatnej lezącej naprzeciw kata / dlugosci przyprostokatnej lezacej przy kacie
tg a = 1/4
1/4 = x/12 x=3
5) wiekszy kąt lezy naprzeciw wiekszego boku czyli 6 ( bo 6^2 = 36 > 2p{7}^2 = 4*7=28 )
c^2 = a^2 + b^2
c^2 = 6^2 + (2p{7})^2
c^2 = 36 + 28 = 64 => c=8
sin a = a/c = 6/8 = 3/4