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Nadia1978
a fost răspuns

1. Daca x=3 si y+z=10, calculeaza:
a) 7 · x+7·y+7·z b) 5· x + 5·y - 5·z c) 5 · x + 10 · y + 10 · z d) 100 · x - (9 · y + 9 · y + 9 · z)

Va rog!Repede! dau 30 pct!

Răspuns :

Icecon2005
1. Daca x=3 si y+z=10, calculeaza:
a) 7× x+7×y+7×z=7×[x + (y +z)]=7×(13)=91

 b) 5× x + 5×y - 5×z=5×[x + (y +z)]=5×13=65

 c) 5 × x + 10× y + 10× z =5x+10(y+z)=5×3+10×10=15+100=115

d) 100 × x - (9× y + 9×y + 9 · z)=100×3+9×[(x+(y + z)]=300+9×(3+10)=300 + 9×13=300 +117=417

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