5678×(5677+56775677)-5677×(5678+56785678)怎样巧妙计算

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5678×(5677+56775677)-5677×(5678+56785678)怎样巧妙计算
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5678×(5677+56775677)-5677×(5678+56785678)怎样巧妙计算
5678×(5677+56775677)-5677×(5678+56785678)怎样巧妙计算

5678×(5677+56775677)-5677×(5678+56785678)怎样巧妙计算
5678×(5677+56775677)-5677×(5678+56785678)
=5678×(5677×1+5677×10000+5677×1)-5677×(5678×1+5678×10000+5678×1)
=5678×【5677×(1+10000+1)】-5677×【5678×(1+10000+1)】
=5678×5677×10002-5677×5678×10002
=0

5677×(5678#2)-5678×(5677#2)
=5677 ×(5678+56785678)-5678×(5677+56775677)
=5677×[5678+5678×(1+10000)]-5678×[5677+5677×(1+10000)
=5677× 5678+5677×5678×(1+10000)-5678×5677+5678 ×5677×(1+10000)
=0
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原式=5677*5678(1+10001)-5677*5678(1+10001)=0

5678×(5677+56775677)-5677×(5678+56785678)
=5678×5677+5678×56775677-5677×5678-5677×56785678
=5678×56775677-(5678-1)×(56775677+10000+1)
=5678×56775677-5678×(56775677+10000+1)-(-1)×(56775677+...

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5678×(5677+56775677)-5677×(5678+56785678)
=5678×5677+5678×56775677-5677×5678-5677×56785678
=5678×56775677-(5678-1)×(56775677+10000+1)
=5678×56775677-5678×(56775677+10000+1)-(-1)×(56775677+10000+1)
=5678×56775677-5678×56775677-5678×10000-5678+56775677+10000+1
=(-56780000-5678)+(56775677+10000+1)
=0

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