Oblic wartość wyrażenia dla podanego x.
a) (x+5)²-(x-1)²-12(x+2), x=1+√3
b) (x-3)²+(2x+1)²+5(x+1)(1-x), x=15-√12/2
c) (x-3)(x+3)(2x²+18), x=√11
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