<span>а) 4p</span>²<span>-( x + y)</span>²=4p²-x²-2xy-y²<span>
б) a</span>²<span>-( b+c) =a</span>²-b-c<span>
в) x-y+x</span>²<span>-2xy+y</span>²=(x-y)+(x-y)²=(x-y)(1+x-y)<span>
г) k</span>²<span>+2mk+m</span>²<span>-k-m=(k+m)</span>²-(k+m)=(k+m)(k+m-1)
4x - 5 ≥ 2x - 4
4x - 2x ≥ 5 - 4
2x ≥ 1
x ≥ 1/2
x ∈ [ 0,5; + ∞)
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