Question

X+y=29
Y+3z=21
Calculati 2x + 5y + 9z

Answer 1

Răspuns: 121

Explicație pas cu pas:

[( x + y ) + ( y + 3 z ) ] × 2 + ( y + 3 z) = ( 29 + 21 ) × 2 + 21

( x + 2 y + 3 z ) × 2 + ( y + 3 z ) = 50 × 2 + 21

2 x + 4 y + 6 z + y + 3 z = 100 + 21

2 x + 5 y + 9 z = 121

Answer 2

x+y=29

y+3z=21

2x+5y+9z=?

aduni primele 2 relatii

x+y+y+3z=29+21

x+2y+3z=50

aduni x+y=29

2x+3y+3z=79

aduni y+3z=21

2x+4y+6z=100

aduni y+3z=21

2x+5y+9z=121