stiind ca,x=23siy+z=41,calculați;3x+2y+2z;4y+4z-5x;5x+3y+3z.

Răspuns

Explicație pas cu pas:

x = 23   si   y + z = 41

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3 x + 2 y + 2 z =

= 3 × 23 + 2 × ( y + z ) =

= 69 + 2 × 41 =

= 69 + 82 =

= 151

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4 y + 4 z - 5 x = 49

= 4 × ( y + z ) - 5 × 23 =

= 4 × 41 - 115 =

= 164 - 115 =

= 49

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5 x + 3 y + 3 z = 238

= 5 × 23 + 3 × ( y + z ) =

= 115  + 3 × 41 =

= 115 + 123 =

= 238