2.19+6.48+27.81-1.38-5.48-0.62算试

问题描述:

2.19+6.48+27.81-1.38-5.48-0.62算试

(2.19+27.81)-(1.38+0.65)+6.48-5.48

=30-2+6.48-5.48
=28+1
=29