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How to do the math homework of grade one (calculated as required, 4: 6 continuous addition and subtraction 2: 18 continuous subtraction 3: 9 continuous addition 3: 7), please help.
Continuously add 4: 6-starting from 6, add 4 in turn, that is, 6, 10, 14, 18, 22. ...

Subtract 2: 18 continuously-subtract 2 from 18, namely18, 16, 14, 12, 10. ...

Continuous decrease of 3: 9-9, 6, 3, 0. ...

Continuously add 3: 7-7, 10, 13, 16. ...

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