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x (przekreślone=) 0
a) 15*x= (3-x)*7
15x=21-7x
21x=21/21
x=1
b)
5x= 2x-3
3x=-3/3
x=-1
c)
(4x+1)* (1/2x+2)= x(2x+1)
2x^2+ 1/2 x+8x=2x^2+x
2x^2-2x^2+8 1/2x=0
8 1/2x=0
x=-8 1/2
d)x(x+2)=(x+1)^2
x^2+2x=x^2+2x+1
e)4(2x-2)=5(x-1)
8x-8=5x-5
3x=3
x=3
f)
x(x+3)= (x+1)(x-1)
x^2+3x=x^2-1
3x=-1
x=-1/3
a)
15x+7x=21
21x=21/:21
5x=2x-3
5x-2x=-3
3x=-3/:3
3x+x=2x+2
3x+x-2x=2
2x=2/:2
d)
2x+2x=2x+1
2x+2x-2x=1
2x=1/:2
x=1/2
e)
5x-5=8x-8
5x-8x=5-8
-3x=3/:(-3)
2x+3x=2x-1
2x+3x-2x=-1
3x=-1/:3
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x (przekreślone=) 0
a) 15*x= (3-x)*7
15x=21-7x
21x=21/21
x=1
b)
5x= 2x-3
3x=-3/3
x=-1
c)
(4x+1)* (1/2x+2)= x(2x+1)
2x^2+ 1/2 x+8x=2x^2+x
2x^2-2x^2+8 1/2x=0
8 1/2x=0
x=-8 1/2
d)x(x+2)=(x+1)^2
x^2+2x=x^2+2x+1
x=1
e)4(2x-2)=5(x-1)
8x-8=5x-5
3x=3
x=3
f)
x(x+3)= (x+1)(x-1)
x^2+3x=x^2-1
3x=-1
x=-1/3
a)
15x=21-7x
15x+7x=21
21x=21/:21
x=1
b)
5x=2x-3
5x-2x=-3
3x=-3/:3
x=-1
c)
3x+x=2x+2
3x+x-2x=2
2x=2/:2
x=1
d)
2x+2x=2x+1
2x+2x-2x=1
2x=1/:2
x=1/2
e)
5x-5=8x-8
5x-8x=5-8
-3x=3/:(-3)
x=-1
f)
2x+3x=2x-1
2x+3x-2x=-1
3x=-1/:3
x=-1/3