A.x1+x2+x3+x4=0,但至少x4≠0 |
B.x1=x2=x3=x4=0 |
C.x1,x2,x3,x4,中两个为0,另两个非0 |
D.不存在这样的有理数 |
A.180 | B.156 | C.178 | D.150 |
A.正数 | B.负数 | C.非负数 | D.非正数 |
1 |
2 |
1 |
2 |
1 |
3 |
2 |
3 |
2 |
3 |
1 |
3 |
1 |
4 |
1 |
2 |
3 |
4 |
3 |
4 |
1 |
2 |
1 |
4 |
1 |
20 |
1 |
10 |
3 |
20 |
4 |
20 |
19 |
20 |
19 |
20 |
1 |
20 |
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