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b) ( 1-√5 )² =1-2√5+5=6-2√5
c) ( 4-3√2 )² =16-24√2+18=34-24√2
d) ( ²/₃x-6 )² =4/9x²-8x+36
e) ( 0,1x-2,5 )² =0,01x²-0,5x+6,25