sinx |
x |
3 |
2 |
sin(-x) |
-x |
sinx |
x |
|sinx| |
|x| |
sinx |
x |
xcosx-sinx |
x2 |
3π |
2 |
4 |
9π2 |
3π |
2 |
π |
2 |
sin2 |
2 |
sin3 |
3 |
sinx |
x |
sinx |
x |
sinx |
x |
-xcosx+sinx |
x2 |
sinα |
α |
sinα |
α |
sinβ |
β |
sinβ |
β |
A.“x=1”是“x2-3x+2=0”的充分不必要条件 |
B.对于命题p:∃x∈R,使得x2+x+1<0;则¬p:∀x∈R,均有x2+x+1≥0 |
C.命题“若m>0,则方程x2+x-m=0有实根”的逆否命题为“若方程x2+x-m=0无实根,则m≤0” |
D.命题“若xy=0,则x、y中至少有一个为零”的否定式“若xy≠0,则x、y都不为零” |
A.4 | B.3 | C.2 | D.1 |
A.①④ | B.①③ | C.②④ | D.①② |
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