Question

phân tích thành nhân tử

b) 5x(x-1)-3x(x-1)

c) x(x+y)-5x-5y

d) x^2+xy+x

e) x(x-y)+y(y-x)

Answer 1

a, 5x(x-1)-3x(x-1)=(5x-3x)(x-1)=2x(x-1)

b, x(x+y)-5x-5y=x(x+y)-5(x+y)=(x-5)(x+y)

c, x²+xy+x=x(x+y+1)

d, x(x-y)+y(y-x)=x(x-y)-y(x-y)=(x-y)(x-y)=(x-y)²

Answer 2

b)5x(x-1)-3x(x-1)=x(x-1).(5-3)=x(x-1).2

c)x(x+y)-5x-5y=x(x+y)-(5x+5y)=x(x+y)-[5(x+y)[=(x+y).(x-5)

d)x^2+xy+x=x(x+y+1)

e)x(x-y)+y(y-x)=x(x-y)-(x-y).y=(x-y).(x-y)