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現在高125.6÷12.56=10(分米)原來高10+2=12(分米)底面半徑是12.56÷3.14÷2=2(分米)底面積是2×2×3.14=12.56(平方分米)側面積是12.56×12=150.72(平方分米)表面積是12.56×2+150.72=175.84(平方分米)體…
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