f(x) |
x |
|
f(x) |
x |
x2+5x+4 |
x |
4 |
x |
4 |
x |
x•
|
|
A.a>ab>ab2 | B.ab2>ab>a | C.ab>a>ab2 | D.ab>ab2>a |
1 |
a |
1 |
a |
1 |
b |
A.1个 | B.2个 | C.3个 | D.4个 |
A.ab>ac | B.ac(a-c)<0 | C.cb2<ab2 | D.c(b-a)<0 |
|
A.x⊗y=y⊗x |
B.(x⊗y)⊗z=x⊗(y⊗z) |
C.(x⊗y)2=x2⊗y2 |
D.c•(x⊗y)=(c•x)⊗(c•y)(其中c为常数) |
A.a>b,c>d⇒a-c>b-d | B.a>b⇒
| ||||
C.ac<bc⇒a<b | D.ac2>bc2⇒a>b |
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