Rozwiąż równania :
a) 3x + 1 = 7
b) 5x - 6 = 14
c) -3a + 4 = 22
d) 19 = 2n + 4
e) 7 + 2x = 18
f) 8 - 4x = 0
g) -5 - 3a = 1
h) x/5 + 7 = 18
i) -7 + 3n/5 = 14
j) -3/4 - 1 1/4x = -5,75
k) -2 = -2,5x +8
l) -2 + x/5,3 = 8
Proszę o jak najszybszą odpowiedź potrzebne na dziśaj jest to na ocene ,za pierwszą dobrą odpowiedź daje NAJ.
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A)
3x+1=7 /-1
3x=6 / :3
x=2
B)
5x-6=14 /+6
5x=20 /:5
x=4
C)
-3a +4=22 /-4
-3a=18 / *(-1)
3a=-18 /:3
a=6
D)
19=2n+4 /-4
15=2n / :2
n=7,5
E)
7+2x=18 /-7
2x=11 /:2
x=5,5
F)
8-4x=0 /+8
-4x=8 /*(-1)
4x=-8 / :4
x=-2
G)
-5-3a=1 /+5
-3a=6 ?*(-1)
3a=-6 /:3
a=-2
H)
x/5 + 7= 18 /-7
x/5=11 /*5
x=55
I)
-7+3n/5 = 14 /+7
3n/5= 21 /*5
3n=105 /:3
n=35
J)
-3/4 - 1 i 1/4x = -5,75
-3/4 - 1 i 1/4x= -5 i 3/4 /+3/4
-1 i 1/4x = -5
5/4x=-20/4 / *4/5
x=40/20
x=2
K)
-2=-2,5x +8 /+2
0=-2,5x +10 /+2,5x
2,5x=10 /:2,5
x=4
I)
-2+x/5,3 = 8 /+2
x/5,3 =10 /*5,3
x=53
:)
a)3x +1 = 7
3x = 7 - 1
3x=6 | :3
x= 2
b) 5x - 6 = 14
5x = 14 +6
5x = 20 | :5
x = 4
c) -3a + 4 = 22
-3a = 22 - 4
-3a = 18 | : -3
a = -6
d) 19 = 2n +4
- 2n = 4 - 19
- 2n = -15 | : -2
n = 7.5
e) 7 +2x = 18
2x = 18 - 7
2x = 11 | :2
x = 5.5
f) 8-4x = 0
-4x = 0 - 8
-4x = -8 | :-4
x = 2
g) -5 -3a = 1
-3a = 1 +5
-3a = 6 | : - 3
a = -2
h) x/5 + 7 = 18 | *5
x + 35 = 90
x = 90 - 35
x = 45
i) -7 + 3n/5 = 14 |*5
-35 + 3n = 70
3n = 70 +35
3n = 105 | :3
n = 35
j) -3/4 - 1 1/4x = -5,75
-3/4 - 5/4x = - 23/4 |*4
-3 - 5x = -23
-5x = -23 + 3
-5x = -20 | : -5
x = 4
k) -2 = -2.5x +8
2.5x = 8 +2
2.5x = 10 | :2.5
x= 4
l) -2 + x/5,3 = 8 | *5.3
-10.6 + x = 42.4
x = 42.4 +10.6
x = 53