Question

4)
X+21= 35,3; 3x + 1< 32,02 în N
5)
2x - 5,3=0,78; 12 - (x - 1)=2,4
6)
[3: (0,2 - 0,1)] : [2,5. (0,8+1,2)=
7)
(1 +22 +33):25 + 1376°=
8)
4,03 · 10 - 1530 : 102 + 6,2 . 102 + 15,07
9)
{[(10+345)- 55]: 1003-50= Ajutatima va rog ​

Answer 1

4)

x + 21 = 35.3

x = 35,3 - 21

x = 14.3

S = {14.3}

3x + 1 < 32.02

3x < 32.02 - 1

3x < 31.02

x < 31.02 : 3

x < 10.34

S = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10}

5)

2x - 5.3 = 0.78

2x = 0.78 + 5.3

2x = 6.08

x = 6.08 : 2

x = 3.04

S = {3.04}

12 - (x - 1) = 2.4

x - 1 = 12 - 2.4

x - 1 = 9.6

x = 9.6 + 1

x = 10.6

S = {10.6}

6)

[3 : (0.2 - 0.1)] : [2.5 (0.8 + 1.2)] = (3 : 0.1) : (2 + 3) = 30 : 5 = 6

7)

(1 + 22 + 33) : 25 + 1376 = 56 : 25 + 1376 = 2.24 + 1376 = 1378.24

8)

4.03 • 10 - 1530 : 102 + 6.2 • 102 + 15.07 = 40.3 - 15 + 632.4 + 15.07 = 25.3 + 632.4 + 15.07 = 657.7 + 15.07 = 672.77

9)

{[(10+345) - 55] : 1003 - 50} = [(355 - 55) : 1003 - 50] = (300 : 1003 - 50) = 0.29 - 50 = -49.71