meng do, meng wrong.hais. yday doing tut 10 for maths, omgggg. there were a handful of looooooong questions la. not the question is long. the working was damn tiring. esp this question 3!!! oh gosh. did so long, think it took me near an hour. and in the end WRONG. oh my... maybe there is a shorter method. this can kill sia!!!
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