有一道奥数题不会哇,谁能告诉我,要答案和过程,急急急急急!!!!!
推荐回答(4个)
根据数被11整除的特性,若abcd能被11整除,则a+c-b-d也能被11整除
1+4=2+3 ;1+5=2+4;2+5=3+4;共3种,
ac 和 bd的选择有两种,ac中数值选择又有两种,bd中数值选择有两种
共2*2*2=8
3*8=24种
根据数被11整除的特性,若abcd能被11整除,则a+c-b-d也能被11整除
1+4=2+3 :1243 1342 4213 4312 2134 2431 3124 3421
2+4=5+1 2541 2145 4521 4125 5214 5412 1452 1254
共16个
1243 1342 1452 2134 2354 2453 2541 3124 3245 3421 3542 4125 4213 4235 4312 4521 4532 5214 5324 5412 5423
21个
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