Question

va roggg mult,dau coroana,repede,mulumesc​

Answer 1

a)x*(y+z)=-10

3xy+3xz=?


xy+xz=-10 | *3

3(xy+xz)=3*(-10)

3xy+xz=-30

b)x=-3

y+z=6

xy+xz=? =>x*(y+z)=> -3*6=-18

c)x-y=7

z=-4

zx-zy=?

z(x-y)=> -4*7=-38

d)y=-2

x+z-t=-9

-xy-zy+ty=?

-xy-zy+ty=K | *(-1)

xy+zy-ty=-k => y(x+z-t)=-K =>

=>-2*(-9)=18=> K=-18

Deci -xy-zy+ty=-18

Sper ca te-am ajutat