Question

1) Efectuati : a) 1 cincime+(-3 doimi) x (-4 noimi) = 1 pe 2+(-3 pe 2)x (-4 pe 9)=

b) (-2 intreg si 1 pe 2) : (-2,5) - : {-3+(-1 pe 14) : (-5 pe 7)} :0,001 =?

c)1 pe 1000x1001 + 1 pe 1002x1002 + 1 pe 1002x1003 + ...........+1 pe 1999x2000 =?

Multumesc!

Answer 1

1/5+(-3/2)*(-4/9)=1/2+(-3/2)*(-4/9)
1/5+(-3/2(*(-4/9)-1/2+(-3/2)*(-4/9)=0
(1/5+((0-3/2)*(0-4/9)))-(1/2+((0-3/2)*(0-4/9)))=0
(1/5+((0-3/2)*(0-4/9)))-(1/2+((0-3/2)*-4/9))=0
1/5+((0-3/2)*(8-4/9)))-(1/2+2/3)=0
3+2*2/6=7/6
(1/5+((0-3/2)*(0-4/9)))-7/6=0
(1/5+((0-3/2)*-4/9))-7/6=0
(1/5+2/3)-7/6
3+2*5/15=13/15
13/15-7/6=0
13*2-(7/5)/30= -3/10
-3/10=0
-3/10*10=0*10
-3=0