（5.3*3.75+3.75*3.5）/2.2

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（5.3*3.75+3.75*3.5）/2.2（5.3*3.75+3.75*3.5）/2.2（5.3*3.75+3.75*3.5）/2.2=3.75*（5.3+3.5）/2.2=3.75*8.8/2.

（5.3*3.75+3.75*3.5）/2.2
（5.3*3.75+3.75*3.5）/2.2

（5.3*3.75+3.75*3.5）/2.2
=3.75*（5.3+3.5）/2.2 =3.75*8.8/2.2 =8.8/2.2*3.75 =4*3.75 =15