2) Решить уравнения:
7x + 1 = 15
25x - 52 =23
6x +11 = 2x - 5
10 +22,7x = 4,7x +28
8,2 - 3x = 11,7 + 2x
5 – (x-2) = 4x +17
10x + 2,5 = 12 – (10x – 10,5)
87 – 2x = 2(4x+56)
3(x + 1 ) + 11 = 34 – 2x
4 + 5(2x+1) = 39
2x + 8 + x = 13 – x + 19
-12(2 – x) = 6x + 48
35 – 7(5 - x) = x + 12
49x = 270 – (x + 20)
-11x +52 = 46x – (48+ 37x)
7,2x – 6 = 2,2x + 14
3,6 – 1,2x =1,4x – 1,6
1,5 + 5,2x = (4,8x – 1) – 6,7
850 – 225x = 400
159x – 21,87 = 84x + 278,13
Даю 20 баллов
Ответы
Пошаговое объяснение:
7х+1=15
7х=15-1
7х=14
х=14÷7
х=2
25х-52=23
25х=23+52
25х=75
х=75÷25
х=3
6х+11=2х-5
6х-2х=-5-11
4х=-16
х=-16÷4
х=-4
10+22,7х=4,7х+28
22,7х-4,7х=28-10
18х=18
х=18÷18
х=1
8,2-3х=11,7+2х
-3х-2х=11,7-8,2
-5х=3,5
х=3,5÷(-5)
х=-0,7
5 – (x-2) = 4x +17
5-х+2=4х+17
7-х=4х+17
-х-4х=17-7
-5х=10
Х=10÷(-5)
Х=-2
10x + 2,5 = 12 – (10x – 10,5)
10х+2,5=12-10х-10,5
10х+2,5=1,5-10х
10х+10х=1,5-2,5
20х=-1
Х=-1÷20
Х=-0,05
87 – 2x = 2(4x+56)
87-2х=8х+112
-2х-8х=112-87
-10х=25
Х=25÷(-10)
Х=-2,5
3(x + 1 ) + 11 = 34 – 2x
3х+3+11=34-2х
3х+14=34-2х
3х+2х=34-14
5х=30
Х=30÷5
Х=6
4 + 5(2x+1) = 39
4+10х+5=39
9+10х=39
10х=39-9
10х=30
Х=30÷10
Х=3
2x + 8 + x = 13 – x + 19
3х+8=32-х
3х+х=32-8
4х=24
Х=24÷4
Х=6
-12(2 – x) = 6x + 48
-24+12х=6х+48
12х-6х=48+24
6х=72
Х=72÷6
Х=12
35 – 7(5 - x) = x + 12
35-35+7х=х+12
7х=х+12
7х-х=12
6х=12
Х=12÷6
Х=2
49x = 270 – (x + 20)
49х=270-х-20
49х=250-х
49х+х=250
50х=250
Х=250÷50
Х=5
-11x +52 = 46x – (48+ 37x)
-11х+52=46х-48-37х
-11х+52=9х-48
-11х-9х=-48-52
-20х=-100
Х=-100÷(-20)
Х=5
7,2x – 6 = 2,2x + 14
7,2х-2,2х=14+6
5х=20
Х=20÷5
Х=4
3,6 – 1,2x =1,4x – 1,6
-1,2х-1,4х=-1,6-3,6
-2,6х=-5,2
Х=-5,2÷(-2,6)
Х=2
1,5 + 5,2x = 4,8x – 1 – 6,7
1,5+5,2х=4,8х-7,7
5,2х-4,8х=-7,7-1,5
0,4х=-9,2
Х=-9,2÷0,4
Х=-23
850 – 225x = 400
-225х=400-850
-225х=-450
Х=-450÷(-225)
Х=2
159x – 21,87 = 84x + 278,13
159х-84х=278,13+21,87
75х=300
Х=300÷75
Х=4