Question

Desfaceti parantezele:
a) (x+y)(u+v)
b) (u - v)(x+y)
c) (a - b)(c - d)
d) (b- a)(x+y)
Urgent va rog frumos

Answer 1

a) (x+y)(u+v)=x•u+x•v+y•u+y•v
b) (u - v)(x+y)=u•x+u•y-v•x-v•y
c) (a - b)(c - d)=a•c-a•d-b•c+b•d
d) (b- a)(x+y)=b•x+b•y-a•x-a•y