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3(1+√7)² -2(√7-3)²+(4√2-√5)(4√2+√5)=19+18√7
Pozdrawiam :)
b)3(1+2√7+7) - 2(7-6√7+9)+ (4√2)²- √5²= (3+6√7+21)-(14-12√7+18)+32-5= 3+6√7+21-14+12√7-18+32-5=19+18√7