Question

Sa se calculeze in doua moduri produsele de numere reale:


Pls Am nevoie urgent
Dau 40puncte+coronita

Answer 1

a) (√2+√3)²=2+2√6+3=5+√6

(√2+√3)(√2+√3)=√2(√2+√3)+√3(√2+√3)=2+√6+√6+3=6+2√6

b) (√5-√2)²=5-2√10+2=7-2√10

(√5-√2)(√5-√2)=√5((√5-√2)-√2(√5-√2)=7-2√10

c) (5+a)²=25+10a+a²

(5+a) (5+a)=5 (5+a)+a (5+a)=25+10a+a²

d) (2a-5b)²=4a²-20ab+25b²

(2a-5b)(2a-5b)=2a(2a-5b)-5b(2a-5b)=4a²-20ab+25b²

e) (4+m)²=16+8m+m²

(4+m)(4+m)=4(4+m)+m(4+m)=16+8m+m²

f) (√2-x)²=2-2√2x+x²

(√2-x)(√2-x)=√2(√2-x)-x(√2-x)=2-2√2x+x²