The solution of inequality about X, 2x + 1 / X ≥ - 3

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• 14. How to lay the floor of 5m long and 3M wide with two triangular floors with right angle sides of 30cm and 10cm respectively? How to lay the floor of 3M wide and 5m long?
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• 18. As shown in the figure, in the parallelogram ABCD, e and F are on the sides of AD and BC respectively, and AE = cf. the following results are obtained: (1) the △ Abe ≌ △ CDF; (2) the parallelogram bfde is a parallelogram
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• 20. To verify Goldbach's conjecture with VB programming, that is, an even number greater than or equal to 6 can be expressed as the sum of two prime numbers Try not to use too complicated and high-end sentences. We haven't learned many of them Private Sub Form_ Click() Dim a As Long,b As Long,c As Long,i As Long,t As Long c = a - b Do A = Val (InputBox ("input not less than 6 even")) Loop Until a >= 6 And a Mod 2 = 0 If (b = 2 Or b = 3) And (c = 2 Or c = 3) Then Print a + "=" + b + "+" + c Else For i = 2 To Sqr(b) If b Mod i = 0 Then For t = 2 To Sqr(c) If c Mod t = 0 Then Print a + "=" + b + "+" + c Next t Next i If i > Sqr(b) Then If t > Sqr(c) Then Print a + "=" + b + "+" + c End If End If End Sub Seek correction