-14х=7
х=7/(-14)
х=-1/2
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Раскроем скобки справа
3x-5 = 3x^2+2x-3x-2-6x^2+5x-6x+5
3x-5= -3x^2-2x+3
3x^2+5x-8=0
D=121=11^2
x1=1; x2=-8/3
A) (x+1+√x+√x)*(√x-1)/(√x-1)(√x+1)=(√x+1)^2/(√x+1)=1+√x
б)(√7-√2)-5/sqrt(√7+√2)^2)=(√7-√2)-5/(√7+√2)=(7-2-5)/(√7+√2)=0
в)(a-b)(√a-√b)/(√a-√b)^2=(a-b)/(√a-√b)=√a+√b