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a fost răspuns

a)2•×+7•y+7•1=

b)17•×+17•y+17•7-10=

c)5•×+10•y+10•z=

d)100•×-(9•y+9•z)=

Daca x=3 și y+z=10 calculeaza.

urgent dau coroana+20 de puncte

Răspuns :

Lonely11
a)2•×+7•y+7•1= 2×3+7y+7=6+7y+7=13+7y
b) 17•×+17•y+17•7-10=17x+17y+119-10=17×3+17y+109=51+17y+109=160+17y

sau 17•×+17•y+17•7-10=17(x+y+1×7)-10=17(3+y+7)-10=17(10+y)-10=170+17y-10=160+17y
c) 5•×+10•y+10•z=5×3+10(y+z)=15+10×10=15+100=115
d)100•×-(9•y+9•z)=100×3-[9(y+z)]=300-(9×10)=300-90=210