Question

DACA X+Y=8 SI Y+2Z=35 CALCULATI
5X+13Y+16Z,3Y-2X+10Z,7X+10Y+6Z,4ORI(2Z+Y)+3X+3Y

Answer 1

4(2z+y)+3x+3y=4x35+3(x+y)=4x35+3x8=140+24=164                                                5x+13y+16z=5x+5y+8y+16z=5(x+y)+8(y+2z)=5x8+8x35=40+280=320                  7x+10y+6z=7x+7y+3y+2z+4z=7(x+y)+2y+(y+2z)+4z=7x8+35+2(y+2z)=56+35+2x35=91+70=161                                              3y-2x+10z=3y-2x+6z+4z=3(y+2z)-2x+4z=3x35-2(x-2z)=70-2(x-2z)=2(35-x+2z) la acest ultim ex cred ca este o greseala de semn