Nǐ shuō de méicuò.
你说得没错。
You're right.
Notes:
你(nǐ): you
说(shuō): to say, to speak
得(de): particle word
没错(méicuò): right, correct
Example:
A:他太帅了!
tā tài shuài le.
He's so handsome.
B:你说得没错。
Nǐ shuō de méicuò.
You're right.