问题 填空题

2.5×1.9×4=______×______×1.9

32×10.1=32×(______+______)=______×______+______×______.

答案

2.5×1.9×4,

=(2.5×4)×1.9,

=10×1.9,

=19;

32×10.1,

=32×(10+0.1),

=32×10+32×0.1,

=320+3.2,

=323.2;

故答案为:2.5,4;10,0.1,32,10,32,0.1.

实验题
单项选择题 B1型题