A.若x2=1,则x=1 | B.若x=y,则
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C.若
| D.若x<y,则x2<y2 |
x |
y |
1 |
x |
1 |
y |
A.若a>b,c>d,则ac>bc | B.若ac>bc,则a<b | ||||
C.若
| D.若a>b,c>d,则a-c>b-d |
A.y=sinx+cosx是周期函数 |
B.1是方程x2-1=0的根 |
C.15能被3或4整除 |
D.梯形是等腰梯形 |
1 |
a |
A.①② | B.②③ | C.③④ | D.②④ |
A.若a>b,则ac>bc | B.若a>b>0,则a2>b2 | ||
C.若|x-3|>1,则2<x<4 | D.若
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a |
b |
c |
b |
0 |
b |
0 |
a |
b |
0 |
a |
0 |
b |
0 |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
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a |
b |
a |
b |
a |
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a |
0 |
b |
c |
A.1 | B.2 | C.3 | D.4 |
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