có định caỳ 24M trong 1 ngay ko

a) mx+my+5x+5y

= m(x+y)+5(x+y)

=(x+y)(m+5)

b) ma+mb-a-b

=m(a+b)-(a+b)

= (a+b)(m-1)

c) 1-xa-x+a

= (1-x)-(xa-a)

= (1-x)-a(x-1)

=(1-x)+a(1-x)

= (1-x)(1+a)

d) (a-b)²-(b-a)(a+b)

= (a-b)²+(a-b)(a+b)

= (a-b)[(a-b)(a+b)]

= (a-b)(a²-b²)

=(a-b)(a-b)(a+b) = (a-b)²(a+b)

= (a+b)(a²-ab+b²)+c³

=-c(a²-ab+b²)+c³

= -c(a²+2ab+b²-3ab)+c³

=-c((a+b)²-3ab)+c³

= -c((-c)²-3ab)+c³

= -c(c²-3ab)+c³

= -c³+3abc+c³

=3abc=3