101✘798+7986一2✘798怎么简便记算?
3个回答
展开全部
101×798+798×6-2×798
=(101+6-2)×798
=105×798
=105×(800-2)
=84000-210
=83790
=(101+6-2)×798
=105×798
=105×(800-2)
=84000-210
=83790
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展开全部
101×798+7986-2×798
=101×798-2×798+7986
=(100+1)×798-2×798+7986
=7980+798-2×798+7986
=7980+7986+798-2×798
=15966-798
=15168
=101×798-2×798+7986
=(100+1)×798-2×798+7986
=7980+798-2×798+7986
=7980+7986+798-2×798
=15966-798
=15168
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