(x-1)(x+1)(√x+1) (x-1)(x+1)(√x+1)
...=lim ---------------------- = lim ----------------------- = lim (x+1)(√x+1)=(1+1)(√1+1)=2*2=4
x-->1 (√x-1)(√x+1) x-1
1в) -3х=6х+18
-9х=18
х=-2.
3)(4-8х-3х-9)/12=(2-4х)/5
(-11х-5)/12=(2-4х)/5
-55х-25=24-48х
-7х=49
х=-7
(X-5)^2/(10-2X)= (X-5)^2/[2(5-X)]= (x-5)^2/[-2(x-5)]=(x-5)/-2=(5-x)/2
ax²-4a= a(x²-4)= a*(x-2)*(x+2)