Question

数学五年级习题（1题）简便计算 12.5*（8+0.4）*0.25

Answer 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