2(2+1)是個啥意思,為啥要忽略中間的符號。對我來說這就是2*(2+1)=6, 忽略那個*號我就當先乘了
2(2+1)是個啥意思,為啥要忽略中間的符號。對我來說這就是2*(2+1)=6, 忽略那個*號我就當先乘了
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