6.5X3.5+0.65X65=65X(0.35+0.65)=65
=65x0.35+0.65x65=65x(0.35+0.65)=65x1=65
6.5乘3.5+0.65乘65=65乘0.35+0.65乘65=65乘(0.35+0.65)=65乘1=65
6.5×6.5+6.5×3.5=10x6.5=65