406×405405-405×406406如何简便计算?
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九点4+0点八,5.3点七四怎样简便计算?
题目意思不明确。如果是:
9.4+0.8
=10.2
5+3.74
=8.74
题目意思不明确。如果是:
9.4+0.8
=10.2
5+3.74
=8.74
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406x405405-405x406406
=(405+1)405405-405(405405+1001)
=405x405405+405405-405x405405-405x1001
=405405-405(1000+1)
=405405-405000-405
=405405-405405
=0
=
=(405+1)405405-405(405405+1001)
=405x405405+405405-405x405405-405x1001
=405405-405(1000+1)
=405405-405000-405
=405405-405405
=0
=
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406×405405-405×406406
=(405+1)×405405-405×406406
=405405+405×405405-405×406406
=405405+405(405405-406406)
=405405+405(-1001)
=405405-405×1001
=405405-405(1000+1)
=405405-405×1000-405
=405405-405000-405
=0
=(405+1)×405405-405×406406
=405405+405×405405-405×406406
=405405+405(405405-406406)
=405405+405(-1001)
=405405-405×1001
=405405-405(1000+1)
=405405-405×1000-405
=405405-405000-405
=0
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