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Fie x+y=24,x-y=8 si z=10.Calculati:a)2x+2y;b)3x-3y;c)xy+yx d)xz-yz

Răspuns :

Cosmin2412004
x+y=24
x-y=8⇒x=y+8
z=10
y+8+y=24
2y=16
y=8
x=16
a)2x+2y=24×2=48
b)3x-3y=8×3
c)xy+yx=8×16+16×8=128+128=256
d)xz-yz=16×10-8×10=160-80=80

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