Question

Calculati folosind formulele de calcul prescurtat: a) (7-4√3)*(7+4√3)+(3√2-2√5)²+(3√2+2√5)². (Va rog ajutati-ma dau coroana)

Answer 1

a)7²-(4√3)²+(3√2)²-2*3√2*2√5+(2√5)²+(3√2)²+2*3√2*2√5+(2√5)²=49-16*3+9*2-12√10+4*5+9*2+12√10+4*5=49-48+18-12√10+20+18+12√10+20=1+38+38=1+76=77

Answer 2

(7-4 radical din 3)la puterea a doua +(9*2-4*5)+(9*2+4*5)=
49-2*7*4 radical din 3+(4 radical din 3)la puterea a doua+(18-20)+(18+20)=
49-56 radical din 3+16*3-2+38=
49-56 radical din 3+48-40=
49-56 radical din 3+8