如题所述
第1个回答 2015-04-23
24x25x7
解:
=(4x6)x25x7
=4x25x6x7
=100x(6x7)
=100x42
=4200
78x101-18
=78x(100+1)-18
=78x100+78-18
=7800+78-18
=7800+(78-18)
=7800+60
=7860
祝学习进步。
解:
=(4x6)x25x7
=4x25x6x7
=100x(6x7)
=100x42
=4200
78x101-18
=78x(100+1)-18
=78x100+78-18
=7800+78-18
=7800+(78-18)
=7800+60
=7860
祝学习进步。
第2个回答 推荐于2016-10-24
24x25x7
=6x4x25x7
=(4x25)x(6x7)
=100x42
=4200
78x101-18
=78x100+78x1-18
=7800+78-18
=7800+60
=7860本回答被提问者采纳
=6x4x25x7
=(4x25)x(6x7)
=100x42
=4200
78x101-18
=78x100+78x1-18
=7800+78-18
=7800+60
=7860本回答被提问者采纳