Problem: When a new document is created and a formula is inserted, you can use mathtype to edit it. After saving the document, the formula is opened for the second time. Double-click the formula, but you cannot edit the formula.
Solution:
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Step 1:
Click the "insert → object" command world, as shown in
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Step 2:
Select mathty and click OK, as shown in figure
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Step 3:
Return to world, and double-click the formula you want to edit to enter mathtype.