如题所述
第1个回答 2019-11-30
(25-2.5)X40
=(25-2.5)X4X10
=(25X4-2.5X4)X10
=(100-10)X10
=90X10
=900本回答被网友采纳
=(25-2.5)X4X10
=(25X4-2.5X4)X10
=(100-10)X10
=90X10
=900本回答被网友采纳
第2个回答 2019-11-30
(25-2.5)×40
=25×40−2.5×40
=1000-100
=900
=25×40−2.5×40
=1000-100
=900
第3个回答 2019-12-22
(25-2.5)×40
=25×40-2.5×40 (乘法分配律)
=1000-100
=900
=25×40-2.5×40 (乘法分配律)
=1000-100
=900
第4个回答 2019-11-30
25x40-2.5x40
=1000-100
=900
=1000-100
=900