[转帖]5.15 Math jj

smart

my first problem: /-45/ divided by X equals to -/-15/, x? 2. m<n<r<s<t for all number, the product of the five number is positive, which one following is true?a: mn>0 b: rs>0,c: st>o 3, only remeber the other is DS that the normal retail price of two products, ask which one is greater? (notice: this question is so vague in my mind and I think I got the false answer) a, A product, more than 6000 to the normal price, B product , less than 6000 to the normal product b, increased by 10% of the normal price of A product , decreased by 10% of the normal price of B product