4.5×5.7+4.5×3.3+4.5=4.5×(5.7+3.3+1)=4.5×10=45
4.5*5.7+4.5*3.3+4.5=4.5*(5.7+3.3+1)=4.5*10=45
=4.5×(5.7+3.3+1)=4.5×10=45