Question

Calculati:
Dau coroana

Answer 1

f) 18÷x=-2 (inmultim cu 18)
x= 18•-2
x=-36

g)x÷(-16/25)=-5/4
ו(-25/16)=-5/4 (mutam -la x)
-x•25/16=5/4 (impartim la 25/16)
-x=5/4÷25/16
-x=5/4•16/25 (simplificam 5 cu 25 si 4 cu 16)
-x=4/5
x=4/5

h)2x+9=13 (scadem 9)
2x=4 (impartim la 2)
x=2

i)6+1 , 6x =-10 (impartim la 6)
7 , x= -10/6 (simplificam prin 2)
7 , x=-5/3

k)x/5+x-2/6=4 intregi si 3/2 (aducem la acelasi numitor)
6x/30 + 5x-10/30 = 4•2-3/2
6x/30+5x-10/30=5/2 (amplificam cu 15)
6x/30+5x-10/30= 75/30
6x+5x-10=75
11x-10=75 (adunam 10)
11x=85 (impartim la 11)
x= 85/11

Sper ca te am ajutat