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a) x + 8 = 36
b) x : 3 = 20
c) u - 25%u = 16 lub 75%u = 16
d) y + 10%y = 15 lub 110%y = 15
2.
2(x-1) = 3x
2(2-1) = 3*2
2*1 = 6
2 6
nie spełnia
2(0-1) - 3*0
2*-1 = 0
-2 0
nie spełnia
2(-2-1)=3*-2
2*-3 = -6
-6 = -6
spełnia
3.
a) 36 + 6 = -2x + 4
42 = -2x +4
42 - 4 = -2x
38 = -2x
19 = -x
x = -19
b) (x-7)-2(3x+5) = 3
x-7 - 6x - 10 = 3
-5x - 17 = 3
-5x = 20
5x = -20
x = -4
b)x/30 = 20
c)75%u=16
d)15=110%y
2
2x-2=3x
x=-2
Można tez podstawiac kazda liczbe
2(-2-1)=3*(-2)
-6=-6
x=2
2(2-1)=3*2
2≠6
x=0
2*(-1)=3*0
-2≠0
3
a) 42=-2x+4
-2x=38
x=-19
b) (x-7) -6x - 10 = 3
-17 - 5x =3
- 5x = 20
x = -4