17x-2x-2,35=4,1 ... 7,98: (2x+0,18) = 19 ... 24 * (3x-5,2) = 0,12 ... 7x+5x+0,28=8,92 ... 12,7-4,5x=8,29 ... (x-4,7) * 3,4=12,92 ... 2,472: (30-y) = 0,12 ... (5,12+x) * 0,14=8,4 ... (6,3-x) * 15=3,3

1) 17 х - 2 х - 2.35 = 4.1;. 2) 7.98 : (2 х + 0.18) = 19

15 х = 4.1 + 2.35 19 * (2 х + 0.18) = 7.98

15 х = 6.45 38 х + 3.42 = 7.98

х = 6.45 : 15 38 х = 7.98 - 3.42

х = 0.43. 38 х = 4.56

х = 4.56 : 38

х = 0.12

3) 24 * (3 х - 4.2) = 0.12. 4) 7 х + 5 х + 0.28 = 8.92

72 х - 100.8 = 0.12. 12 х = 8.92 - 0.28

72 х = 0.12 + 100.8. 12 х = 8.64

72 х = 100.92. х = 8.64 : 12

х = 100.92 : 72. х = 0.72

х = 1.402. 6) (х - 4.7) * 3.4 = 12.92

5) 12.7 - 4.5 х = 8.29. 3.4 х - 15.98 = 12.92

4.5 х = 12.7 - 8.29. 3.4 х = 12.92 + 15.98

4.5 х = 4.41. 3.4 х = 28.9

х = 4.41 : 4.5. х = 28.9 : 3.4

х = 0.98. х = 8.5

7) 2.472 : (30 - у) = 0.12;. 8) (5.12 + х) * 0.14 = 8.4

0.12 * (30 - у) = 2.472. 0.7168 + 0.14 х = 8.4

3.6 - 0.12 у = 2.472. 0.14 х = 8.4 - 0.7168

0.12 у = 3.6 - 2.472. 0.14 х = 7.6832

0.12 у = 1.128. х = 7.6832 : 0.14

у = 1.128 : 0.12. х = 54.88

у = 9.4

9) (6.3 - х) * 15 = 3.3

94.5 - 15 х = 3.3

15 х = 94.5 - 3.3

15 х = 91.2

х = 91.2 : 15

х = 6.08