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3(x-1)+5=8
3x-3+5=8 /-5
3x-3=3 /+3
3x=6 /:3
x=2
odpowiedz c
-3,5x + 1,5 = 4 [ 2- 10 ( x - 1 ) ] + 2 = -3,5x + 1,5 = 4 [ 2 - 10x - 10 ] + 2 =
= -3,5x + 1,5 = 8 - 40x -40 + 2 = -3,5x +40x = 8 - 40 + 2 - 1,5 =
= 36,5x = -31,5 // 36,5
x= - 0,86
2.
3(x-1)+5=8
3x - 3 + 5 = 8
3x = 8 - 5 + 3
3x = 6 // 3
x = 2
odp. c
3.
a) 7+3=2(4-x)
7 + 3 = 8 - 2x
2x = 8 - 7 - 3
2x = -4 // 2
x = -2
b) (6-x)*=(x-3)*2
6 - x = 2x - 6
- 3x = -6 - 6
-3x = -12 // -3
x = 4
c) 0,5x+20=4,4x
0,5x - 4,4x = 20
- 3,9 = 20 // -3,9
x = -5,13
d) 20+x=20-[20-(20-x)]
20 + x = 20 - [ 20 - 20 + x ]
20 + x = 20 - 40 + x
20 + x = - 20 + x
2x = -20 - 20
2x = -40 // 2
x = -20
odp. liczba 5 nie spełnia żadnego równania
a)-3,5 *1 + 1,5= 4[2-10(1-1)] +2
-3,5+1,5=4* (-8) =2
-2= -32 +2
-2=(-30)
b) -3,5*3+1,5= 4[2-10(3-1)]+2
-10,5+1,5= 4[ -8*2]+2
-9=4* (-16) +2
-9=-64+2
-9= (-62)
c) -3,5*5+1,5= 4[2-10(5-1)] +2
17,5 +1,5= 4[-8*4] +2
19=-32 +2
19= (-30)
Zad2
3(x-1)+5=8
3(2-1)+5=8
3 * 1 +5=8
3+5=8
czyli c.
Zad3
a) 7+3=2(4-5)
7+3=-2
b) (6-5)=(5-3) *2
1=4
c)0,5 * 5 = 4,4 *5
2,5=22
d) 20+5= 20-[20-(20-5)]
25=15