6.4×3/2+2.2×3/2+0.4×3/2简算
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6.4×3/2+2.2×3/2+0.4×3/2简算
6.4×3/2+2.2×3/2+0.4×3/2简算
6.4×3/2+2.2×3/2+0.4×3/2简算