Пошаговое объяснение:
2(3 + y) + 3(2y + 4) = 2
6 + 2y + 6y + 12 = 2
18 + 8y = 2
8y = 2 - 18
8y = -16
y = -16 : 8
y = -2
3(3u + 1) − 4(u − 4) = 29
9u + 3 - 4u + 16 = 29
5u + 19 = 29
5u = 29-19
5u = 10
u = 10:5
u = 2
7(2x + 3) = 91 − 4(3x − 2)
14x + 21 = 91 - 12x + 8
14x + 21 = 99 - 12x
14x + 12x = 99 - 21
26x = 78
x = 78:26
x = 2
2(2v − 4) = 4(3 − v) − 44
4v - 8 = 12 - 4v - 44
4v - 8 = -32 - 4v
4v + 4v = -32 + 8
8v = -24
v = -24:8
v = -3
5(3z − 2) = −16 − 3(2z + 5)
15z - 10 = -16 - 6z - 15
15z - 10 = -31 - 6z
15z + 6z = -31 + 10
21z = -21
z = -21:21
z = -1
4(6y − 5) = 5(2y − 3) + 51
24y - 20 = 10y - 15 + 51
24y - 20 = 10y + 36
24y - 10y = 36 + 20
14y = 56
y = 56:14
y = 4
3(2x − 1) = 55 − 4(x + 2)
6x - 3 = 55 - 4x - 8
6x - 3 = 47 - 4x
6x + 4x = 47 + 3
10x = 50
x = 50:10
x = 5
1)14,3 • 0,6 -5,7 • 1,4
14,3*0,6 = 8,58
5.7*1.4=7.98
8.58-7.98= 0.6
2)(54-23,42) • 0,08
54-23,42= 30,58
30,58*0,08 = 2,4464
3)(4,125 – 1,6) • (0,12 +7,3)
4,125 – 1,6 = 2,525
0,12 +7,3 = 7,42
7,42 × 2,525 = 18,7355
4)(139-23,48) : 38 + 4,35 • 18
139-23,48 = 115,52
115,52 : 38 = 3,04
4,35 * 18 = 78,3
78,3 + 3,04 = 81,34
5)(1,87+1,955) : 0,85 –(3 • 1,75 – 2,5) • 1,62
1,87 + 1,955 = 3,825
3 * 1,75 = 5,25, 5,05 - 2,5 = 2,75
3,825 / 0,85 - 2,75 * 1,62
4,5 - 4,455 = 0,045.
6)1,24 : 3,1+12 : 0,25 - 2 : 25 + 18 : 0,45
1, 24 : 3,1 = 0,4;
12 : 0, 25 = 48;
2 : 25 = 0,08;
18 : 0,45 = 40;
0,4 + 48 = 48,4;
48,4 - 0,08 = 48,32;
48,32 + 40 = 88,32.
7)52-(15,54 : 1,48 + 3,4) • 2,8
15,54:1,48=10,5
10,5+3,4=13,9
13,9*2,8=38,92
52-38,92=13,08
