已知a=11×66+12×67+13×68+14×69+15×70÷11×65+12×66+13×67+14×68+15×69×100,求|a|.(本题有分数线,我不会画)11×66+12×67+13×68+14×69+15×70是分子,11×65+12×66+13×67+14×68+15×69是分母,×

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已知a=11×66+12×67+13×68+14×69+15×70÷11×65+12×66+13×67+14×68+15×69×100,求|a|.(本题有分数线,我不会画)11×66+12×67+13×68+14×69+15×70是分子,11×65+12×66+13×67+14×68+15×69是分母,×
已知a=11×66+12×67+13×68+14×69+15×70÷11×65+12×66+13×67+14×68+15×69×100,求|a|.
(本题有分数线,我不会画)11×66+12×67+13×68+14×69+15×70是分子,11×65+12×66+13×67+14×68+15×69是分母,×100是分母除分子后乘100
打错了,×100是分子除分母后再×100.抱歉抱歉!

已知a=11×66+12×67+13×68+14×69+15×70÷11×65+12×66+13×67+14×68+15×69×100,求|a|.(本题有分数线,我不会画)11×66+12×67+13×68+14×69+15×70是分子,11×65+12×66+13×67+14×68+15×69是分母,×
11×66=(13-2)×(68-2)=13×68-2×13-2×68+4
12×67=(13-1)×(68-1)=13×68-13-68+1
13×68=13×68
14×69=(13+1)×(68+1)=13×68+13+68+1
15×70=(13+2)×(68+2)=13×68+2×13+2×68+4
相加就是分子了,同样可求分母(因数用中间的13和67)