三年级奥数题及答案巧算(二)(2)
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2017-11-30 14:32:51
解答::①式=4723-723-189
=4000-189=3811
②式=2356-256-159
=2100-159
=1941
解答::①式=4723-723-189
=4000-189=3811
②式=2356-256-159
=2100-159
=1941