求助：gwd数学第24套第9题，为什么选A不是选D？求讲解！！

first lets make sure whats the question is asked,it asked to u to deduct the meaning of *.
we can know from the question that the* means either addition, subtraction, or multiplication.
lets see 1,0*2=2,the * must be addition to achieve the result.sufficient.
2.2*0=2.the* can either be addition or subtraction,insufficient.
to answer your doubt,the question said the * can only be one of the algorithm mentioned above,hence 2 is not sufficient enough to answer that.
hope it helps.
good luck.

first lets make sure whats the question is asked,it asked to u to deduct the meaning of *.
we can know from tto achieve the result.sufficient.
2.2*0=2.the* can either be addition or subtraction,insufficient.
to answer your doubt,the question said the * can only be one of the algorithm mentioned above,hence 2 is not sufficient enough to answer that.
hope it helps.
good luck.

我才6练级，拜拜，哈哈，我来搞经验的，哈丷