Determinati valoarea produsului
P=(10,3-x)x(9,3-x)x...x(0,3-x),
unde x=5,3
Calculati suma
S=(96,34+x)+(86,34+x)+...+(16,34+x),unde x=3,66
Determinati valoarea expresiei
E=3xa+8xb+6xc,stiind ca
a+2xb=5,2 si b+3xc=4,2

1

Răspunsuri

2014-09-09T12:40:54+03:00
P=(10,3-x) * (9,3-x) * ... * (5,3-x) * .... * (0,3-x)
daca x=5,3    5,3-5,3=0 si atunci P=0


96,34+3,66=100
86,34+3,66=90
76,34+3,66=80
........................
16,34+3,66=20
S=100+90+80+70+60+50+40+30+20=4*120+60=540
(am grupat: 100+20,  90+30,...)

E=3 x a +8 x b + 6 x c=3 x a + 6 x b + 2 x b + 6 x c= 3 x (a+2 x b) + 2 x (b+3 x c)
deci, E=3 x 5,2 + 2 x 4,2=15,6+8,4=24
17 4 17