解：567x424-567 577x557
????=567x(424-1) 557x577
????=567x423 557x577
????=(557 10)x423 557x577
????=557x423 557x577 423x10
????=557x(423 577) 4230
????=557x1000 4230
????=55700 4230
????=59930
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逃答 : 解：567x424-567 577x557
=567x(424-1) 557x577
=567x423 557x577
=(557 10)x423 557x577
=557x423 557x577 423x10
=557x(423 577) 4230
=557x1000 4230
=557000 4230
=561230。
567*424-567 577*557
=567*423 577*557
=(500 67)*(400 23) (500 77)*(500 57)
=200000 26800 11500 1541 250000 38500 28500 4389
=561230
原式=567*424-567 567*567=567*（424-1 567）=567*990=567*100-567*10
剩下的本身算吧
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