1. Rozwiąż równania
a) x+7=22
b) x-5=11
c) 2x=6
d) 3/4x=6
e) 3x+1=-5
f) -2x+3=5
g) 4x-7=1
h) -5x+2=17
2. Rozwiąż równania
a)2x+3=x-5
b)-x-2=x-9
c)3x+4=-2x-1
d)-4x+3=-x-6
e)2(x-1)=8
f)-3(x+2)=9
g)3(x+1)+2=-4
h) -2(x-2)-7=-5
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1.
a)
x+7 = 22
x = 22-7
x = 15
=====
b)
x-5 = 11
x = 11+5
x = 16
=====
c)
2x = 6 /:2
x = 3
====
d)
3/4x = 6 I*4
3x = 24 /:3
x = 8
====
e)
3x+1 = -5
3x = -5-1
3x = -6 /:3
x = -2
=====
f)
-2x+3 = 5
-2x = 5-3
-2x = 2 /:(-2)
x = -1
=====
g)
4x-7 = 1
4x = 1+7
4x = 8 /:4
x = 2
====
h)
-5x+2 = 17
-5x = 17-2
-5x = 15 /:(-5)
x = -3
=====
2.
a)
2x+3 = x-5
2x-x = -5-3
x = -8
=====
b)
-x-2 = x-9
-x-x = -9+2
-2x = -7 /:(-2)
x = 3,5
======
c)
3x+4 = -2x-1
3x+2x = -1-4
5x = -5 /:5
x = -1
=====
d)
-4x+3 = -x-6
-4x+x = -6-3
-3x = -9 /:(-3)
x = 3
====
e)
2(x-1) = 8
2x-2 = 8
2x = 8+2
2x = 10 /:2
x = 5
====
f)
-3(x+2) = 9
-3x-6 = 9
-3x = 9+6
-3x = 15 /:(-3)
x = -5
=====
g)
3(x+1)+2 = -4
3x+3+2 = -4
3x = -4-5
3x = -9 /:3
x = -3
====
h)
-2(x-2)-7 = -5
-2x+4-7 = -5
-2x-3 = -5
-2x = -5+3
-2x = -2 /:(-2)
x = 1
====
1
a)
x+7=22|-7
x=15
b)
x-5=11|+5
x=16
c)
2x=6|:2
x=3
d)
3/4x=6|:3/4
x=6·4/3
x=8
e)
3x+1=-5|-1
3x=-6
x=-2
f)
-2x+3=5|-3
-2x=2|:(-2)
x=-1
g)
4x-7=1|+7
4x=8|:4
x=2
h)
-5x+2=17|-2
-5x=15|:(-5)
x=-3
2
a)
2x+3=x-5
2x-x=-5-3
x=-8
b)
-2x-2=x-9
-2x=-9+2
-2x=-7|·(-1)
2x=8
x=4
c)
3x+4=-2x-1
3x+2x=-1-4
5x=-5
x=-1
d)
-4x+3=-x-6
-4x+x=-6-3
-3x=-9
x=3
e)
2(x-1)=8
2x-2=8
2x=10
x=5
f)
-3(x+2)=9
-3x-6=9 ---------->gdy przed nawiasem stoi liczba ujemna to w nawiasie zmieniamy znak
-3x=9+6
-3x=15|:(-3)
x=-5
g)
3(x+1)+2=-4
3x+3+2=-4
3x=-4-3-2
3x=-9
x=-3
h)
-2(x-2)-7=-5
-2x+4-7=-5
-2x-3=-5
-2x=-5+3
-2x=-2
x=1