Question

1：：：A的绝对值等于1,B的绝对值等于4,A×B＜0,问,A＋B等于?

Answer 1

1：|A|=1,A=1,或 A=-1|B|=4,B=4,或 B=-4AB < 0,A和B符号相反,所以：A=1 B=-4,A＋B = -3或 A=-1 B=4,A＋B = 32：（-0.12)*(1/12)*(-100) = 0.12 * 100 * 1/12= 12 * 1/12 = 13:(-3/7)(-1/2)(-8/15) = -(3/7)(1/2)(8/1...