Question

Calculati folosind formula de calcul prescurtat:
a) (√2-1)² +√8-6√3+(3+√3)²-(√15-2)² -2√60;
b) (3√5+√2)² -3√2×√20+(5√2-√5)²+2√2×√125;
c) (√6-2)²+2√2×√12+(2√2-1)²-√32+(√7+√3)²+(√5-2)(√5+2);
d) (2√2-√3)(2√2+√3)-2(√3-1)²+(4-2√3)²-(3-2√3)².

Dau corona!​

Answer 1

Răspuns:

Explicație pas cu pas:

(a-b)^2=a^2-2ab+b^2

(a+b)^2=a^2+2ab+b^2

(a+b)(a-b)=a^2-b^2

atasez rezolvarea