Question

问1道数学计算题0.999×1.3-0.111×2.7

Answer 1

原式=9*0.111*1.3-0.111*2.7

=（9*0.3+9*1）*0.111-0.111*2.7

=2.7*0.111+0.999-0.111*0.27

=0.999