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ZAD.15
a) 5-x/2-(2x+5)=2x-1
b)x-1/3 +5(x+3)=2-x
c)2(2x+7)-x-2/5=9+2x
d)-2(3x+10)-x+8/4=3(x+5)
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a) 5-x/2-(2x+5)=2x-1
5-x/2 -2x-5=2x-1
5-x/2-5=-1 /*2
10-x-10=-2
-x=-2 /*(-1)
x=2
b)x-1/3 +5(x+3)=2-x
x-1/3 +5x+15=2-x
6x-1/3+15=2-x
6x+x=2-15+1/3
7x=13+1/3 /*3
21x=39+1
21x= 40 /:21
x=1,9
c)2(2x+7)-x-2/5=9+2x
4x+14-x-2/5=9+2x
3x+14-2/5=9+2x /*5
15x+70-2=45+10x
15x-10x=45-68
5x=-23 /:5
x= -4,6
d)-2(3x+10)-x+8/4=3(x+5)
-6x-20-x+2=3x+15
-7x-18=3x+15
-7x-3x=15+18
-4x=33 /:(-4)
x=-8,25
a)
5-x/2-(2x+5)=2x-1
5-1/2X-2X-5=2X-1
-2 1/2X-2X=-1
-4 1/2X=-1
-9/2X=-1/*(-2/9
X=2/9
b)
x-1/3 +5(x+3)=2-x
X-1/3+5X+15=2-X
6x+x=-14 2/3+2
7x=16 2/3 /:7
x=50/3*1/7
x=50/21
x=2 8/21
c)
2(2x+7)-x-2/5=9+2x
4x+14-x-2/5=9+2x
3x-2x=9-13 3/5
x= -4 3/5
d)
-2(3x+10)-x+8/4=3(x+5)
-6x-20-x+2=3x+15
-7x-3x=15+18
-10x= 33/:(-10)
x=-3,3