数与算符 Flashcards by Harry Xu

4 4 4 4 = 0

4-4+4-4=0

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4 4 4 4 = 8

4-4+4+4=8

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1 2 3 4 5 6 = 9

1-2+3-4+5+6=9
1+2+3+4+5-6=9
-1+2+3+4-5+6=9
-1-2-3+4+5+6=9

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6, 7, 8, 9

🔲+🔲-🔲=🔲
🔲+🔲-🔲=🔲

6+9=7+8
⬇️
6+9-7=8
6+9-8=7
7+8-6=9
7+8-9=6

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1, 2, 4, 6, 8

🔲🔲+🔲=🔲🔲
🔲🔲+🔲=🔲🔲

10->20
20->30没有

16+8=24
18+6=24

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