Question

Rozwiąż równanie

a)(5x-2)(x+7)[4-1/3x]=0

b)5x-4x+45x-36=0

c)2x-11x-21=0

Answer 1

A) (5x-2)(x+7)[4-1/3x]=0
5x-2*x-7*(3/3x)=0
5x-2x-21-21x=0
-18x-21=0 /+21
-18x=21 /-18
x=1 3/21
x=1 1/7

b)5x-4x+45x-36=0
46x-36=0 /+36
46x=36 /:46
x=36/46
x=18/23

c)2x-11x-21=0
-9x-21=0 /+21
-9x=21 /:-9
x=-9 1/3

Answer 2

5x-4x+45x-36=0\-4x

1x-45x-36=0\+36

1x-45x=0\/>

1x-0=45x\1

1x=45

 

2x-11x-21=0\+11x

13x-21=0\+21

13x=0\:13

1x=0

 

a} nie wiem