5х-4(2х-1)>=2(2х-5)
2х^2=10х
5x - 8x + 4 >= 4x - 10
7x<=14
x<=2
x (-бесконечности ; 2 ]
2x^2=10x
2x^2-10x=0
x(2x-10)=0
x=0 2x-10=0
x=5
10x^2-5x-4x+4>=4x-10
10x^2-13x+16=0
D=b^2-4ac=169-640
1) корней нет
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Answers & Comments
5x - 8x + 4 >= 4x - 10
7x<=14
x<=2
x (-бесконечности ; 2 ]
2x^2=10x
2x^2-10x=0
x(2x-10)=0
x=0 2x-10=0
x=5
10x^2-5x-4x+4>=4x-10
10x^2-13x+16=0
D=b^2-4ac=169-640
1) корней нет
2x^2-10x=0