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daca x +y=8 si y+2z=35 calculati;
a)5x+13y+16z;
b)7x+10y+6z;
c)4•(2z+y)+3x+3y;

Răspuns :

Spidie
x +y=8 si y+2z=35

a)5x+13y+16z= 5x+5y  +8y +16z= 5*(x+y)+8*(y+2z)=5*8+8*35=40+280=
=320

b)7x+10y+6z= 7x+7y  + 3y+6z=7*(x+y) +3*(y+2z)=7*8+3*35=56+105=161

c)4•(2z+y)+3x+3y= 4*35+3*(x+y)=140+3*8=140+24=164

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