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a) 2(5a-3)-a-4(3a-2)=0
10a-6-a-12a+8=0
-3a=-2 /:(-3)
a=2/3
b) 2b-(1-b)=11-b
2b-1+b=11-b
4b=12 /:4
b=3
c) 2/5 (x-2)=x+4
2/5x-4/5=x+4
-3/5x=24/5 /:(-3/5)
x=-8
d) 3y-2(y-1)=-6
3y-2y+2=-6
y=-8
e) 3(3-5y)=90-5(3y-2)
9-15y=90-15y+10
0=91
f) 1/4z+(z-6)=2/3(z-2)
1/4z+z-6=2/3z-4/3
7/12z=14/3 /:(7/12)
z=8
II
5(2-3x)≤3(2-x)
10-15x≤6-3x
-12x≤-4 /:(-12)
x≥1/3
a) 2(5a-3)-a-4(3a-2)=0
10a + 6 - a - 12a - 2 = 0
-3a + 4 = 0
-3a = -4 / : (-3)
a =1 jedna trzecia
b) 2b-(1-b)=11-b
2b - 1 - b = 11 -b
b + b = 12
2b = 12 /:2
b = 6
c) 2/5 (x-2)=x+4
2/5x + 2 =x+4
2/5x - x = 4 - 2
- 3/5x = 2 /(- 3/5)
x = 3, 3
d) 3y-2(y-1)=-6
3y - 2y + 2 = -6
y = -6 + 2
y = -4
e) 3(3-5y)=90-5(3y-2)
3(3-5y)=90-5(3y-2)
6 - 15y = 90 – 15y + 10
-15y + 15y = 100 – 6
0 = 94
f) 1/4z+(z-6)=2/3(z-2)
1/4z+(z-6)=2/3(z-2)
¼ z + z – 6 = 2/3z – 4/3
1 1/4z – 2/3z = - 4/3 – 6
1z = - 7 / :1
z = 7
ZADANIE II
5(2-3x)≤3(2-x)
10 - 15x < 6 - 3x
3 >12x
najmniejsza liczba to 3