Rozwiąż równanie:
a) 2(x + 3) = 18
b) x + 3(x - 2) = -22
c) 5x - 2(x + 3) = 9
d) 4(2X + 3) -5X = -3
e) 2(x + 1) + 5x = 16
f) -4x - 3(2x + 1) = 7
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a) 2(x + 3) = 18
2x+6=18
2x=18-6
2x=12 |:2
x=6
spr.
2*6+6=18
12+6=18
18=18
b) x + 3(x - 2) = -22
x+3x-6=-22
4x=-22+6
4x=-16 |:4
x=-4
spr. -4+ 3(-4-2)=-22
-4+3(-6)=-22
-4-18=-22
-22=-22
c)5x - 2(x + 3) = 9
5x-2x-6=9
3x=9+6
3x=15 |:3
x=5
spr.
5*5-2(5+3)=9
25-2(8)=9
25-16=9
9=9
d) 4(2X + 3) -5X = -3
8X+12-5X=-3
3X=-3-12
3X=-15 |:3
X=-5
spr.
4(2*-5+3)-5(-5)=-3
4(-10+3)+25=-3
4(-7)+25=-3
-28+25=-3
-3=-3
e) 2(x + 1) + 5x = 16
2x+2+5x=16
7x=16-2
7x=14 |:7
x=2
2(2+1)+5*2=16
6+10=16
16=16
f) -4x - 3(2x + 1) = 7
-4x-6x-3=7
-10x=10 |:10
-x=1 |*-1
x= -1
spr.
-4*-1-3(2*-1+1)=7
4-3(-2+1)=7
4-3(-1)=7
4--3=7
7=7