Question

Rozwiąż równania a) u/2 + u/3 = 7 + u/4 b) 2x + 3x/4 = 57 + 5x/7 c) 19 + 5y/8=3y/4 + 2y/3 d) z-14 = z/3 - z/9 e) 7x-13/12 = x-5/2 + x-4/8

Answer 1

a)

u/2+u/3=7+u/4   /*12

6u+4u=84+3u

2u-3u=84

-u=84   /*(-1)

u=84

b)

2x+3x/4=57+5x/7   /*28

56x+21x=1596+20x

77x-20x=1596

57x=1596

x=28

c)

19+5y/8=3y/4+2y/3   /*24

456+15y=18y+16y

15y-34y=-456

-19y=-456

y=24

d)

z-14=z/3-z/9   /*9

9z-126=3z-z

9z-3z+z=126

7z=126

z=18

e)

7x-13/12=x-5/2+x-4/8   /*24

168x-26=12(x-5)+3(x-4)

168x-26=12x-60+3x-12

168x-12x-3x=-60-12+26

153x=-46

x=-46/153