Help me simplify 108:18! 3 / 4:0.6:0.24!

Help me simplify 108:18! 3 / 4:0.6:0.24!

108:18=6:1
3 / 4:2 / 15 = 45:8
0.6:0.24=5:2
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11-4 / 10-1 / 10 + 19 / 10

Original form
=(11 / 10 + 19 / 10) - (3 / 4 + 1 / 4)
=3-1
=2
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Simple calculation of 8.07-9.62 △ 2.6

8.07-9.62÷(2×1.3)
=8.07-9.62÷2÷1.3
=8.07-4.81÷1.3
=8.07-3.7
=4.37

3.9 × 0.8 + 0.6 × 3.9-3.9 × 0.4

3.9 × 0.8 + 0.6 × 3.9-3.9 × 0.4 = 3.9 × (0.8 + 0.6-0.4) = 3.9 × 1 = 3.9 satisfied, please take it in time. Why use 0.6-0.4? Answer: 3.9 × 0.8 + 0.6 × 3.9-0.4 × 3.9 = 3.9 × (0.8 + 0.6-0.4) = 3.9 × 1 = 3.9