用简便运算∶0.25x3.9=？
第1个回答 2016-04-21
用简便运算∶0.25x3.9=？
0.25x3.9=
=0.25*4-0.25-0.1
=1-0.025
=0.975
0.25x3.9=
=0.25*4-0.25-0.1
=1-0.025
=0.975
第2个回答 2016-04-21
原式
=0.25x(4-0.1)
=0.25x4-0.25x0.1
=1-0.025
=0.975
供参考。本回答被网友采纳
=0.25x(4-0.1)
=0.25x4-0.25x0.1
=1-0.025
=0.975
供参考。本回答被网友采纳
