(2002•安徽)解方程组
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(2002•安徽)已知一次函数的图象与双曲线
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交于点(-1,m),且过点(0,1),求该一次函数的解析式.
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(2002•安徽)解不等式3x-2(1-2x)≥1,并把解集在数轴上表示出来.
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(2002•安徽)当a=
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时,计算
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的值.
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(2007•河池)在矩形ABCD中,AB=3,AD=4,P是AD上的动点,PE⊥AC于E,PF⊥BD于F,则PE+PF的值为( )
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A.
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B.2
C.
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D.1
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(2002•安徽)我们知道,溶液的酸碱度由PH确定.当PH>7时,溶液呈碱性;当PH<7时,溶液呈酸性.若将给定的HCl溶液加水稀释,那么在下列图象中,能反映HCl溶液的PH与所加水的体积(V)的变化关系的是( )
A.
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B.
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C.
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D.
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