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  • 鐘面上有1~12個數(shù)字,你能在某些數(shù)的前面添上符號,使添號后的12個數(shù)之和等于零嗎?

    鐘面上有1~12個數(shù)字,你能在某些數(shù)的前面添上符號,使添號后的12個數(shù)之和等于零嗎?
    你有幾種添法?
    數(shù)學人氣:499 ℃時間:2019-08-21 20:38:04
    優(yōu)質解答
    124種:
    1+2+3+4+5+6+7-8-9-10+11-12 = 0
    1+2+3+4+5+6-7+8-9+10-11-12 = 0
    1+2+3+4+5-6+7+8+9-10-11-12 = 0
    1+2+3+4-5+6-7-8-9-10+11+12 = 0
    1+2+3+4-5-6+7-8-9+10-11+12 = 0
    1+2+3+4-5-6-7+8+9-10-11+12 = 0
    1+2+3+4-5-6-7+8-9+10+11-12 = 0
    1+2+3-4+5+6-7-8-9+10-11+12 = 0
    1+2+3-4+5-6+7-8+9-10-11+12 = 0
    1+2+3-4+5-6+7-8-9+10+11-12 = 0
    1+2+3-4+5-6-7+8+9-10+11-12 = 0
    1+2+3-4-5+6+7+8-9-10-11+12 = 0
    1+2+3-4-5+6+7-8+9-10+11-12 = 0
    1+2+3-4-5+6-7+8+9+10-11-12 = 0
    1+2+3-4-5-6-7-8-9+10+11+12 = 0
    1+2-3+4+5+6-7-8+9-10-11+12 = 0
    1+2-3+4+5+6-7-8-9+10+11-12 = 0
    1+2-3+4+5-6+7+8-9-10-11+12 = 0
    1+2-3+4+5-6+7-8+9-10+11-12 = 0
    1+2-3+4+5-6-7+8+9+10-11-12 = 0
    1+2-3+4-5+6+7+8-9-10+11-12 = 0
    1+2-3+4-5+6+7-8+9+10-11-12 = 0
    1+2-3+4-5-6-7-8+9-10+11+12 = 0
    1+2-3-4+5+6+7+8-9+10-11-12 = 0
    1+2-3-4+5-6-7+8-9-10+11+12 = 0
    1+2-3-4+5-6-7-8+9+10-11+12 = 0
    1+2-3-4-5+6+7-8-9-10+11+12 = 0
    1+2-3-4-5+6-7+8-9+10-11+12 = 0
    1+2-3-4-5+6-7-8+9+10+11-12 = 0
    1+2-3-4-5-6+7+8+9-10-11+12 = 0
    1+2-3-4-5-6+7+8-9+10+11-12 = 0
    1-2+3+4+5+6-7+8-9-10-11+12 = 0
    1-2+3+4+5+6-7-8+9-10+11-12 = 0
    1-2+3+4+5-6+7+8-9-10+11-12 = 0
    1-2+3+4+5-6+7-8+9+10-11-12 = 0
    1-2+3+4-5+6+7+8-9+10-11-12 = 0
    1-2+3+4-5-6-7+8-9-10+11+12 = 0
    1-2+3+4-5-6-7-8+9+10-11+12 = 0
    1-2+3-4+5+6+7+8+9-10-11-12 = 0
    1-2+3-4+5-6+7-8-9-10+11+12 = 0
    1-2+3-4+5-6-7+8-9+10-11+12 = 0
    1-2+3-4+5-6-7-8+9+10+11-12 = 0
    1-2+3-4-5+6+7-8-9+10-11+12 = 0
    1-2+3-4-5+6-7+8+9-10-11+12 = 0
    1-2+3-4-5+6-7+8-9+10+11-12 = 0
    1-2+3-4-5-6+7+8+9-10+11-12 = 0
    1-2-3+4+5+6-7-8-9-10+11+12 = 0
    1-2-3+4+5-6+7-8-9+10-11+12 = 0
    1-2-3+4+5-6-7+8+9-10-11+12 = 0
    1-2-3+4+5-6-7+8-9+10+11-12 = 0
    1-2-3+4-5+6+7-8+9-10-11+12 = 0
    1-2-3+4-5+6+7-8-9+10+11-12 = 0
    1-2-3+4-5+6-7+8+9-10+11-12 = 0
    1-2-3+4-5-6+7+8+9+10-11-12 = 0
    1-2-3-4+5+6+7+8-9-10-11+12 = 0
    1-2-3-4+5+6+7-8+9-10+11-12 = 0
    1-2-3-4+5+6-7+8+9+10-11-12 = 0
    1-2-3-4+5-6-7-8-9+10+11+12 = 0
    1-2-3-4-5+6-7-8+9-10+11+12 = 0
    1-2-3-4-5-6+7+8-9-10+11+12 = 0
    1-2-3-4-5-6+7-8+9+10-11+12 = 0
    1-2-3-4-5-6-7+8+9+10+11-12 = 0
    -1+2+3+4+5+6+7-8-9-10-11+12 = 0
    -1+2+3+4+5+6-7+8-9-10+11-12 = 0
    -1+2+3+4+5+6-7-8+9+10-11-12 = 0
    -1+2+3+4+5-6+7+8-9+10-11-12 = 0
    -1+2+3+4-5+6+7+8+9-10-11-12 = 0
    -1+2+3+4-5-6+7-8-9-10+11+12 = 0
    -1+2+3+4-5-6-7+8-9+10-11+12 = 0
    -1+2+3+4-5-6-7-8+9+10+11-12 = 0
    -1+2+3-4+5+6-7-8-9-10+11+12 = 0
    -1+2+3-4+5-6+7-8-9+10-11+12 = 0
    -1+2+3-4+5-6-7+8+9-10-11+12 = 0
    -1+2+3-4+5-6-7+8-9+10+11-12 = 0
    -1+2+3-4-5+6+7-8+9-10-11+12 = 0
    -1+2+3-4-5+6+7-8-9+10+11-12 = 0
    -1+2+3-4-5+6-7+8+9-10+11-12 = 0
    -1+2+3-4-5-6+7+8+9+10-11-12 = 0
    -1+2-3+4+5+6-7-8-9+10-11+12 = 0
    -1+2-3+4+5-6+7-8+9-10-11+12 = 0
    -1+2-3+4+5-6+7-8-9+10+11-12 = 0
    -1+2-3+4+5-6-7+8+9-10+11-12 = 0
    -1+2-3+4-5+6+7+8-9-10-11+12 = 0
    -1+2-3+4-5+6+7-8+9-10+11-12 = 0
    -1+2-3+4-5+6-7+8+9+10-11-12 = 0
    -1+2-3+4-5-6-7-8-9+10+11+12 = 0
    -1+2-3-4+5+6+7+8-9-10+11-12 = 0
    -1+2-3-4+5+6+7-8+9+10-11-12 = 0
    -1+2-3-4+5-6-7-8+9-10+11+12 = 0
    -1+2-3-4-5+6-7+8-9-10+11+12 = 0
    -1+2-3-4-5+6-7-8+9+10-11+12 = 0
    -1+2-3-4-5-6+7+8-9+10-11+12 = 0
    -1+2-3-4-5-6+7-8+9+10+11-12 = 0
    -1-2+3+4+5+6-7-8+9-10-11+12 = 0
    -1-2+3+4+5+6-7-8-9+10+11-12 = 0
    -1-2+3+4+5-6+7+8-9-10-11+12 = 0
    -1-2+3+4+5-6+7-8+9-10+11-12 = 0
    -1-2+3+4+5-6-7+8+9+10-11-12 = 0
    -1-2+3+4-5+6+7+8-9-10+11-12 = 0
    -1-2+3+4-5+6+7-8+9+10-11-12 = 0
    -1-2+3+4-5-6-7-8+9-10+11+12 = 0
    -1-2+3-4+5+6+7+8-9+10-11-12 = 0
    -1-2+3-4+5-6-7+8-9-10+11+12 = 0
    -1-2+3-4+5-6-7-8+9+10-11+12 = 0
    -1-2+3-4-5+6+7-8-9-10+11+12 = 0
    -1-2+3-4-5+6-7+8-9+10-11+12 = 0
    -1-2+3-4-5+6-7-8+9+10+11-12 = 0
    -1-2+3-4-5-6+7+8+9-10-11+12 = 0
    -1-2+3-4-5-6+7+8-9+10+11-12 = 0
    -1-2-3+4+5+6+7+8+9-10-11-12 = 0
    -1-2-3+4+5-6+7-8-9-10+11+12 = 0
    -1-2-3+4+5-6-7+8-9+10-11+12 = 0
    -1-2-3+4+5-6-7-8+9+10+11-12 = 0
    -1-2-3+4-5+6+7-8-9+10-11+12 = 0
    -1-2-3+4-5+6-7+8+9-10-11+12 = 0
    -1-2-3+4-5+6-7+8-9+10+11-12 = 0
    -1-2-3+4-5-6+7+8+9-10+11-12 = 0
    -1-2-3-4+5+6+7-8+9-10-11+12 = 0
    -1-2-3-4+5+6+7-8-9+10+11-12 = 0
    -1-2-3-4+5+6-7+8+9-10+11-12 = 0
    -1-2-3-4+5-6+7+8+9+10-11-12 = 0
    -1-2-3-4-5+6-7-8-9+10+11+12 = 0
    -1-2-3-4-5-6+7-8+9-10+11+12 = 0
    -1-2-3-4-5-6-7+8+9+10-11+12 = 0
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