(1)∵在一个不透明的盒子里,装有四个分别标有数字1,-2,-3,4的小球,
∴小明抽到的数字是负数的概率是:
=2 4
;1 2
故答案为:
.1 2
(2)列表得:
x y | 1 | -2 | -3 | 4 |
1 | (1,1) | (-2,1) | (-3,1) | (4,1) |
-2 | (1,-2) | (-2,-2) | (-3,-2) | (4,-2) |
-3 | (1,-3) | (-2,-3) | (-3,-3) | (4,-3) |
4 | (1,4) | (-2,4) | (-3,4) | (4,4) |
4 |
16 |
1 |
4 |