如题所述
第1个回答 2012-03-28
=36X45
=(40-4)X45
=40X45-4X45
=1800-180
=1620
或者=180X(10-1)
=1800-180
=1620
=(40-4)X45
=40X45-4X45
=1800-180
=1620
或者=180X(10-1)
=1800-180
=1620
第2个回答 2012-03-28
36x5x9
=6x6x5x9
=(5x6)x(6x9)
=30x54
=1620本回答被提问者采纳
=6x6x5x9
=(5x6)x(6x9)
=30x54
=1620本回答被提问者采纳
第3个回答 2012-03-28
36x5x9
=36x(5x9)
=36x45
=1620
=36x(5x9)
=36x45
=1620