数学五年级习题（1题）

12.5*(8+0.4)*0.25
=12.5*8.4*0.25
=12.5*8+0.4*0.25
=100+0.1
=100.1

此题为骗人题,有人会写成
12.5*8+0.4*0.25
很明显是错的
此题可以这样写
12.5*8.4*0.25
=12.5*2.1*4*0.25
=12.5*2.1*1
=12.5*(2+0.1)
=12.5*2+12.5*0.1
=25+1.25
=26.25

12.5*（8+0.4）*0.25
=(50/4)*8.4*(1/4)
=105/4
=26.25