1) D=9-4*4*(-2)=25
x=(3+-5)/4
x1=2
x2=-0.5
2(x+0.5)(x-2)=(x+1)(x-2)
2) D=64-4*3*(-3)=100
x=(-8+-10)/6
x1=1/3
x2=-3
3(x-1/3)(x+3)=(x-1)(x+3)
3)D=4-4*3*(-1)=16
x=(-2+-4)/6
x2=-1
3(x-1/3)(x+1)=(x-1)(x+1)
4)D=25-4*2*(-3)=1
x=(-5+-1)/4
x1=-1
x2=-3/2
2(x+3/2)(x+1)=(x+3)(x+1)
5) (2-10a)(2+10a)
6) (5xy-4)(5xy+4)
7) D=1-4*1*(-30)=121
x=(1+-11)/2
x1=6
x2=-5
(x-6)(x+5)
8)D=1-4*1*(-42)=169
x=(-1+-13)/2
x2=-7
(x-6)(x+7)
D-это дискриминант
1) D=9-4*4*(-2)=25
x=(3+-5)/4
x1=2
x2=-0.5
2(x+0.5)(x-2)=(x+1)(x-2)
2) D=64-4*3*(-3)=100
x=(-8+-10)/6
x1=1/3
x2=-3
3(x-1/3)(x+3)=(x-1)(x+3)
3)D=4-4*3*(-1)=16
x=(-2+-4)/6
x1=1/3
x2=-1
3(x-1/3)(x+1)=(x-1)(x+1)
4)D=25-4*2*(-3)=1
x=(-5+-1)/4
x1=-1
x2=-3/2
2(x+3/2)(x+1)=(x+3)(x+1)
5) (2-10a)(2+10a)
6) (5xy-4)(5xy+4)
7) D=1-4*1*(-30)=121
x=(1+-11)/2
x1=6
x2=-5
(x-6)(x+5)
8)D=1-4*1*(-42)=169
x=(-1+-13)/2
x1=6
x2=-7
(x-6)(x+7)
D-это дискриминант
б) х/(х-4)^2 = x(x+4)/[(x-4)^2*(x+4])] = (x^2+4x)/[(x-4)^2*(x+4])]
7/(х^2-16) = 7/[(x-4)(x+4)] = 7(x-4)/[(x-4)^2*(x+4])] = (7x-28)/[(x-4)^2*(x+4])];
в) 5/(х+1) = 5(x-2)/[(x-2)(x+1)] = (5x-10)/[(x-2)(x+1)]
7/(х-2) = 7(x+1)/[(x-2)(x+1)] = (7x+7)/[(x-2)(x+1)];
г) 4/(х-6) и х/(6-х) = -x/(x-6);
д) х/(х+5)^2 = x(x-5)/[(х+5)^2*(x-5)] = (x^2-5x)/[(х+5)^2*(x-5)]
5/(x^2-25) = 5/[(х+5)*(x-5)] = 5(x+5)/[(х+5)^2*(x-5)] = (5x+25)/[(х+5)^2*(x-5)];
е) 4/(х-3) = 4(x+2)/[(x-3)(x+2)] = (4x+8)/[(x-3)(x+2)]
2/(х+2) = 2(x-3)/[(x-3)(x+2)] = (2x-6)/[(x-3)(x+2)];
ж) х/(х-8) = -3x/(24-3x) и 4х/(24-3х);
з)x/(6-x)^2; - не с чем сравнивать
и)11/(3x+4) = 11(2x-3)/[(2x-3)(3x+4)] = (22x-33)/[(2x-3)(3x+4)]
12/(2х-3) = 12(3x+4)/[(2x-3)(3x+4)] = (36x+48)/[(2x-3)(3x+4)];
к)х/(х-7) = -3x/(21-3x) и 11/(21-3х);
л)x/(7-x)^2 = x(x+7)/[(x-7)^2*(x+7)] = (x^2+7x)/[(x-7)^2*(x+7)]
4/(x^2-49) = 4(x-7)/[(x-7)^2*(x+7)] = (4x-28)/[(x-7)^2*(x+7)];
м)13/(3х-4) = 13(2x+3)/[(3x-4)(2x+3)] = (26x+39)/[(3x-4)(2x+3)]
11/(2х+3) = 11(3x-4)/[(3x-4)(2x+3)] = (33x-44)/[(3x-4)(2x+3)].