如题所述
99X78十178的简便计算
=99x78+78+100
=78x(99+1)+100
=(78+1)x100
=7900
=99x78+78+100
=78x(99+1)+100
=(78+1)x100
=7900
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第1个回答 2016-11-23
=(100-1)×78+178
=100×78-1×78+178
=7800-78+178
=7800+(178-78)
=7800+100
=7900本回答被网友采纳
=100×78-1×78+178
=7800-78+178
=7800+(178-78)
=7800+100
=7900本回答被网友采纳
第2个回答 2016-11-23
(100一1)X78十178
=100X78一1X78十178
=7800一78十178
=7800十100
=7900
=100X78一1X78十178
=7800一78十178
=7800十100
=7900
第3个回答 2016-11-23
100×78+178-78=7800+100=7900