(5х -1)(5х + 1) – 5х(5х + 2)
(5*0.2-1)*(5*0.2+1)-5*0.2*(5*0.2+2)= -7.2
Объяснение:
(5•0,2-1)(5•0,2+1)-5•0,2(5•0,2+2)=
(1-1)(1+1)-1(1+2)=0•2-1-2=-3
(5х -1)(5х + 1) – 5х(5х + 2)
(5*0.2-1)*(5*0.2+1)-5*0.2*(5*0.2+2)= -7.2
Объяснение:
(5•0,2-1)(5•0,2+1)-5•0,2(5•0,2+2)=
(1-1)(1+1)-1(1+2)=0•2-1-2=-3