Odpowiedź:
a)2x+5=17
2x=17-5
2x=12
x=6
b)3x-4=x+9
3x-x=9+4
2x=13
x=7,5
c)2(x+5)=x-4
2x+10+4=x
x=14+2x
x-2x=14
-x=14
x=-14
d)2x+3/5=2-x/3-x
2/5x+3/5=2/3-1/3x-x
2/5x+3/5-2/3=-1 1/3x
2/5x+1 1/3x=-3/5+2/3
6/15x+20/15x=10/15-12/15
21/15x=-2/15
e)(4-5x)(2+x)=-(4+5x2)
4*2+4x+(-5x)*2+(-5x)*x=-4-5x2
8+4x-10x-5x2=-4-5x2
8+4=-5x2-4x+10x+5x2
12=6x
x=2
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Odpowiedź:
a)2x+5=17
2x=17-5
2x=12
x=6
b)3x-4=x+9
3x-x=9+4
2x=13
x=7,5
c)2(x+5)=x-4
2x+10+4=x
x=14+2x
x-2x=14
-x=14
x=-14
d)2x+3/5=2-x/3-x
2/5x+3/5=2/3-1/3x-x
2/5x+3/5-2/3=-1 1/3x
2/5x+1 1/3x=-3/5+2/3
6/15x+20/15x=10/15-12/15
21/15x=-2/15
e)(4-5x)(2+x)=-(4+5x2)
4*2+4x+(-5x)*2+(-5x)*x=-4-5x2
8+4x-10x-5x2=-4-5x2
8+4=-5x2-4x+10x+5x2
12=6x
x=2