简便运算 9876×6789-9877×6788
问题描述:
简便运算 9876×6789-9877×6788
答
=9876*6788+9876-9877*6788
=(9876-9877)*6788+9876
=9876-6788
=3088
好想你们还没有学到负数,这样
=(9877-1)*6789-9877*6788
=9877*6789-6789-9877*6788
=9877*(6789-6788)-6789
=9877-6789
=3088