(-3/5)×（-12）+0.27×5/9+（-12）×（-2/5）+4/9×0.27=?

(-3/5)×（-12）+0.27×5/9+（-12）×（-2/5）+4/9×0.27=?
(-3/5)×（-12）+0.27×5/9+（-12）×（-2/5）+4/9×0.27=?

(-3/5)×（-12）+0.27×5/9+（-12）×（-2/5）+4/9×0.27=?
(-3/5)×（-12）+0.27×5/9+（-12）×（-2/5）+4/9×0.27=(-3/5)×（-12）+（-12）×（-2/5）+0.27×5/9+4/9×0.27=-12+027=-11.73

=(-12)*(-3/5-2/5)+0.27*(5/9+4/9)=12+0.27=12.27

=(-0.6)×(-12)+0.27×0.56+(-12)×(-0.4)+0.45×0.27
=7.2+0.1512+4.8+0.1215
=7.3502+4.8+0.1215
=12.1502+0.1215
=12.2707