55555✘5555 11111✘222225的简便方法

Question

如题所述

Answer 1

1*1=1
11*11=121
111*111=12321
1111*1111=1234321
.
55555*5555=11111*1111*5*5=12344321*5*5=308608025

Answer 2

55555X5555=111110X11110÷4=1234432100÷4=308608025
11111X222225=11111x222220+11111X5=2469086420+55555=2469141975
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Answer 3

55555×5555+11111×222225
=55555×5555+11111×（5×4445）
=55555×5555+（11111×5）×4445
=55555×5555+55555×4445
=55555×（5555+4445）
=55555×10000
=555550000