Question

Rozwiąż równania:

a) 7 - 4a = 7a + 2

b) -8 = 1 - 4x

c) 2 3/4 y = 7

d) 5w - 1 1/2 = -3 2/7 + 1 1/5

* e) 4 (x-0,5) + 2 = 3 - 2 ( 1/2 + 3/5x )

3/4 1/2 itd. = ułamek.

Answer 1

a]

7-4a=7a+2

7-2=7a+4a

11a=5

a=5/11

b]

-8=1-4x

4x=1+8

4x=9

x=9:4=2,25

c]

2¾y=7

y=7:2¾=7:11/4=7×4/11=²⁸/₁₁=2⁶/₁₁

d]

5w-1½=-3²/₇+1⅕

5x=1½-²³/₇+⁶/₅

5x=³/₂-²³⁰/₇₀+⁸⁴/₇₀

5x=¹⁰⁵/₇₀-¹⁴⁶/₇₀

5x=-⁴¹/₇₀

x=-⁴¹/₇₀×⅕=-⁴¹/₃₅₀

e]

4(x-0,5)+2=3-2(½+⅗x)

4x-2+2=3-1-⁶/₅x

4x+⁶/₅x=2

5,2x=2

x=2:5,2=20/52

x=⁵/₁₃

Answer 2

a) 7-4a=7a+2/-7a

7-11a=2/-7

-11a=-5/:-11

a=5/11

 

b)-8=1-4x/+4x

-8+4x=1/+8

4x=9/:4

x=2,25

 

c)2 3/4y=7/: 2 3/4

y=2 6/11

 

d)5w-1 1/2= -3 2/7 + 1 1/5/+1 1/2

5w=-1 11/14+3 7/10 

5w=5 17/35/:5

w=1  17/ 175