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4分米=0.4米,塗油漆的總面積:3.14×0.4×2×5×6,=3.14×(0.4×2×5×6),=3.14×24,=75.36(平方米),一共需要的油漆費:0.5×75.36=37.68(元).答:一共需用油漆費37.68元.
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