学完相反数后,我做了下面的练习:(1)8+(-8)=0,-15+15=0,22+(-22)=0,…(2)-3-3=-6=2×(-3),11-(-11)=22=2×11,-17-17=-34=2×(-17),…(3)5×(-5)=-25=-52,-9×9=-81=-(-9)2,14×(-14)=-196=-142,…(4)7÷(-7)=-1,-16÷16=-1,21÷(-21)=-1,…做完后,经过认真思考,发现有一定的规律,由此得到了相反数的性质:1.一个数与它的相反数之和等于零;2.一个不为零的数与它的相反数之差等于这个数的二倍; After learning the opposite, I did the following exercise: (1) 8 + (- 8) = 0, -15 + 15 = 0,22 + (- 22) = 0, -6 = 2 × (-3), 11 - (- 11) = 22 = 2 × 11, -17-17 = -34 = 2 × (-17) 25 = -52, -9 × 9 = -81 = - (- 9) 2,14 × (-14) = -196 = -142, ... (4) 7 ÷ (-7) = -1, -16 ÷ 16 = -1,21 ÷ (-21) = - 1, ... After done, after careful consideration and found a certain law, thus obtained the nature of the opposite number: 1. A number with its opposite sum Equal to zero; 2. The difference between a nonzero number and its opposite number is equal to twice this number;