Question

Repede va rog!Coroana+follow.​

Answer 1

Explicație pas cu pas:

notăm suma cu x

I=2/3×x+15

rest=x-2/3×x-15

aducem la același numitor

rest=(3×x-2×x-45)/3

rest=(x-45)/3

rest=x/3-15

II=2/5din (x/3-15)

iI=2/5×x/3-2/5×15

II=2/15 × x -6

III=27

I+II+III=x

2/3××x+15+2/15×x-6+27=x

2/3×x+2/15×x+9+27=x

2/3×x+2/15×x+36=x

aducem la același numitor

5x+2x+36×15=15x

7x+540=15x

15x-7x=540

8x=540

x=540:8

x=135/2

x=67,5 lei

I=2/3×x+15

I=2/3×135/2+15

I=135/3+15

I=45+15

I=60 lei

II=2/15×x-6

II=2/15×135/2-6

II=135/15-6

II=9-6

II=3 lei