Question

Dau coroana !!
a) Stiind ca x+y+13=24,determinati 19+2*y+2*x
b) Stiind ca x+3*y+18=54,determinati 6*y+89 + 2*x
c) Stiind ca (x+48)+(y+52)=200,determinati 200+y+x

Answer 1

a)x+y+13=24

x+y=11

19+2*y+2*x=

19+2y+2x=

19+2*(x+y)=

19+2*11=19+22=41

b)x+3*y+18=54

x+3y=54-18=36

6*y+89+2*x=

6y:3y=2

2x:x=2

36*2+89=72+89=161

c)(x+48)+(y+52)=200

x+y+48+52=200

x+y+100=200

x+y=100

200+y+x=

200+100=300

Sper ca te-am ajutat!!!

Answer 2

a) 19+2y+2x
descompunem:
2y=2*10+y=21y
2x=10*2+x=21x=> 19+21y+21x=>x=9 si y=2 sau invers
b) 6y+89+2x
6y=10*6+y=61y
2x=10*2+x=21x=>61y+89+21x=>x=3 si y=5
c) x=50  ;y=50=> 50+48+50+52=200=> 200+50+50=300