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简介:
1.明显的倍数关系
420 ×68+42 ×320 26 ×17+13×66
= 420×68+420×32 =13×2×17+13×66
= 420×(68+32) =13×(34+66)
2. 隐藏的倍数关系
12345+23451+34512+45123+51234
=11111+22222+33333+44444+55555
=(1+2+3+4+5)×11111
=15×11111
3. 拆分后出现倍数关系
36×314+439 ×64
=36×314+(314+125)×64
=36×314+314×64+125×64
=(36+64)×314+125×8×8
=31400+8000
=914000