299x78巧算怎么做 486-299的算式巧算怎么做

299\u4e58\u4ee581\u7684\u5de7\u7b97\u600e\u4e48\u505a

\u56fe

486-299
=486-300+1
=186+1
=187

经济数学团队为你解答，满意请采纳！
299×78
=（300-1）×78
=300×78-78
=23400-78
=23 322

原式等于
78×（300-1）
=78×300-78×1
=23400-78
=23322
回答完毕~

299x78
=（300-1）x78
=300x78-78
=22400-78
=22322
谢谢，请采纳

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