本课配套习题挑战模式4/5
单选题
难度系数:
4.对于任意的两个有理数a、b,下列结论中成立的是()
A:若a+b=0,则a=-b |
B:若a+b>0,则a>0,b>0 |
C:若a+b<0,则a<b<0 |
D:若a+b<0,则a<0 |
一次做对,真牛!
+5奖励规则>
- 提示1:55So5Y+N5L6L5o6S6Zmk5rOV77yM5Y+v5b+r6YCf56qB56C0
- 答案:QQ==
Qu+8jumUmeivr+OAguWPpuWklueahOaDheWGte+8muS4pOS4quaVsO+8jOWPr+S7peS4gOato+aVsO+8jOS4gOi0n+aVsO+8jOS4lOato+aVsOeahOe7neWvueWAvOi+g+Wkp+OAgkMu6ZSZ6K+v44CC5Y+m5aSW55qE5oOF5Ya177yM5Lik5Liq5pWw77yM5Y+v5Lul5LiA5q2j5pWw77yM5LiA6LSf5pWw77yM5LiU6LSf5pWw55qE57ud5a+55YC86L6DLkQu6ZSZ6K+v44CC5LiN6IO956Gu5a6a6LSf5pWw5LiA5a6a5pivYS7lm6DmraTpgIlB44CC