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3 3 2 2 2 2
ав -в +ав -в = (ав-в)(ав+ав*в+в )(ав-в)(ав+в)
12x^2+8x-15x-10>0
12x^2-7x-10>0
D=(-7)^2-4*12*(-10)=49+480=529
x1=7+23/2*12=30/24=10/8=5/4
x2=7-23/2*12=-16/24= - 4/6= - 2/3
1)
2x^2 - 6x+16 >= 15x -3x^2
5x^2 - 21x +16>=0
5x^2 - 21x +16=0
D = 441-320=121
x1=3.2
x2=1
(-беск.;1]u[3,2;+беск)
2)
2x^2-5x+4<=7x-3x^2
5x^2-12x+4<=0
5x^2-12x+4=0
D=144-80=64
x1=2
x2=0.4
[0.4;2]
*мастер живописи*