2.76×3.4+27.6×0.66=2.76×3.4+2.76×6.6=2.76x(3.4+6.6)=2.76x10=27.6
2.76×3.4+27.6×0.66=2.76×3.4+2.76×6.6=2.76×（3.4+6.6）=2.76×10=27.6
