2(2+1)是个啥意思,为啥要忽略中间的符号。对我来说这就是2*(2+1)=6, 忽略那个*号我就当先乘了
2(2+1)是个啥意思,为啥要忽略中间的符号。对我来说这就是2*(2+1)=6, 忽略那个*号我就当先乘了
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