Question

Va rog ajutati-ma :
14)Calculeaza:
a)2a+3a-a= b)3x+49(x+2 )-8= c)14x+3x-10x= d)3x+7+19x+12=
e)4(x+y+16)-3= f)18x+7(x+2)-21x=

25)Determina x si y numere naturale daca:
a)x*y=42 b)x*(y+3)=21 c)x(x+2)=24 d)(x-3)(y-5)=0

28)afla cifra x daca 2x+xx+x1x=708

Answer 1

a) 2a+3a-a=a(2+3-1)=4a
b)3x+49(x+2)-8=3x+49x+98-8=52x+90
c)14x+3x-10x=x(14+3-10)=7x
d)3x+7+19x+12=22x+19
e)4x+4y+64-3=4(x+y)+61
25.a)x*y=42  x,y={2,21}   x,y={6,7} x,y={21,2) x,y={7,6}
 28) 2x+xx+x1x=708       x nu poate fi decat 6 (3*6=18)
       2x+
       xx
     x1x
     708