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若|x+3y-5|与(3x-y-3)2互为相反数,则2x+y=
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若3x-y+12与|2x+3y-25|互为相反数那么x-y2的值为
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25.
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若x的相反数是3|y|=5则xy的值为____________.
若3x-2和4-5x互为相反数则x=
若5x﹣5的值与2x﹣9的值互为相反数则x=
若x+32与〡y-2〡互为相反数求xy的值
1若|2x﹣8|+|y﹣6|=0求2x﹣y的值 2已知有理数mn互为相反数xy互为倒数z的绝对值
如果5x﹣3与﹣2x﹣9是互为相反数求x的值.
若|2x﹣4|与|y﹣3|互为相反数求2x﹣y的值.
若5x+2与﹣3x﹣4互为相反数求3x+5的值.
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如果x+y-52与│3y-2x+10│互为相反数那么xy的值为
x=3,y=2
x=2,y=3
x=0,y=5
x=5,y=0
当x分别取2和-2时多项式x5+2x3-5的值
互为相反数
互为倒数
异号不等
相等
若5x–5的值与2x–9的值互为相反数则x=.
若lgx与lgy互为相反数则
x+y=0
x-y=0
xy=1
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若5x+3与﹣2x+9互为相反数则x=______.
若|x+1|与|2y+3|互为相反数则x=_________y=_________x+y=_____
下列有关命题的说法正确的是
命题“若xy=0,则x=0”的否命题为:“若xy=0,则x≠0”
“若x+y=0,则x,y互为相反数”的逆命题为真命题
命题“
x∈R,使得2x
2
-1<0”的否定是:“
x∈R,均有2x
2
-1<0”
命题“若cosx=cosy,则x=y”的逆否命题为真命题
若7﹣2x和5﹣x的值互为相反数则x的值为
4
2
﹣12
﹣7
若7﹣2x和5﹣x的值互为相反数则x的值为
4
2
﹣12
﹣7
下列有关命题的说法正确的是
命题“若xy=0,则x=0”的否命题为:“若xy=0,则x≠0”
“若x+y=0,则x,y互为相反数”的逆命题为真命题
命题“∃x∈R.,使得2x
2
﹣1<0”的否定是:“∀x∈R.,均有2x
2
﹣1<0”
命题“若cosx=cosy,则x=y”的逆否命题为真命题
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