Question

Упростите выражение :
a)a(b+3)+b(a+3)-3(a+b)
б)2(x-y)+6(y-x)-(4x-4y)
в)a(b+c)-b(a+c)-c(a+b)
г)m(n-t)+n(t-m)+(m-n)

Answer 1

a) ab+3a+ba+3b-3a-3b=ab+ba=ab+ab=2ab
б) 2x-2y+6y-6x-4x-4y= -8x+4y-4y= -8x
в) ab+ac-ba-bc-ca-cb= -bc-cb= -2bc
г) mn-mt+nt-nm+m-n=nt-mt+m-n

Answer 2

а) ab+3a+ab+3b-3a-3b = ab+ab = 2ab
б) 2x-2y+6y-6x-4x+4y = -4x+4y = 4y-4x
в) ab+ac-ab-bc-ac-bc = -2bc
г) mn-mt+nt-mn+m-n = -mt+nt-n+m = m-n-mt+nt