(5.3*3.75+3.75*3.5)/2.2

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spring721 共回答了17个问题 | 采纳率94.1%
 =3.75*(5.3+3.5)/2.2 =3.75*8.8/2.2 =8.8/2.2*3.75 =4*3.75 =15
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