1999×1999+1999+2000
=1999×(1999+1)+2000
=1999×2000+2000
=(1999+1)×2000
=2000×2000
=4000000.
9³-9²-8×9
=9×(9²-9-8)
=9×(81-9-8)
=9×64
=(10-1)×64
=10×64-1×64
=640-64
=576
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1999×1999+1999+2000
=1999×(1999+1)+2000
=1999×2000+2000
=(1999+1)×2000
=2000×2000
=4000000.
9³-9²-8×9
=9×(9²-9-8)
=9×(81-9-8)
=9×64
=(10-1)×64
=10×64-1×64
=640-64
=576
很高兴为您解答,【学习宝典】团队为您答题.
请点击下面的【选为满意回答】按钮.