Question

Repede,va rog! Punctul d si exercitiul 4

Answer 1

Răspuns:

2[3I2x-3I-8]-9=5

2[3I2x-3I-8]=9+5

3I2x-3I-8=14:2

3I2x-3I=7+8

I2x-3I=15:3

I2x-3I=5

________

2x-3=5                   2x=8       x=4      

-2x+3=5 }sistem =>-2x=2 }=>x=-1 }

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10%dinx= 10x/100=x/10 -prima crestere

x+x/10=10x/10+x/10=11x/10 -noul pret

15%din11x/10=15/100·11x/10=33x/200- a doua crestere

33x/200= 2 277

33x=200·2 277

x=455400:33

x=13800lei