Question

bỏ dấu rut gon bieuthuc

a,(a+b)-(a-b)+(a-c)-(a+c)

b,(a+b-c)+(a-b+c)-(b+c-a)-(a-b-c)

Answer 1

(a+b)-(a-b)+(a+c)-(a+c)

=a+b-a+b+a-c-a-c

=a\(\times\)2-a\(\times\)2+b\(\times\)2-c\(\times\)2

Answer 2

(a+b-c)+(a-b+c)-(b+c-a)-(a-b-c)

=a+b-c+a-b+c-b-c+a-a+b+c

=a.3-a.1+b.2-b.2-c.2+c.2

Answer 3

\(\approx\) chúc bn học tốt\(\approx\)