如题所述
第1个回答 2019-03-30
原式=55×27+5×27
=27×(55+5)
=27×60
=1620
=27×(55+5)
=27×60
=1620
第2个回答 2019-03-30
55x27+ 45x3
=55x27+ (55-10)x3
=55x30-30
=50x30+(5-1)x30
=1500+120
=1620本回答被网友采纳
=55x27+ (55-10)x3
=55x30-30
=50x30+(5-1)x30
=1500+120
=1620本回答被网友采纳