主题: 9÷3(1+2)
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旧 Jun 20th, 2011, 14:22     #10
hi13579
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作者: hi13579 查看帖子
Like 9÷3y
if y=(2+1)
then
9÷3y=9÷9=1


if 9÷3(y) = 9
y is not 3;


if 9÷3(y) = 1
y is 3;

so
9÷3(2+1) will be 1
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