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一個數乘10,得到的數比原來的數多36,而一個數乘10得到的數比原來的數多9倍,即36是這個數的9倍,根據除法的意義可知,這個數是36÷9=4. 36÷(10-1) =36÷9, =4. 答:原來的數是4.
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