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21.(1)证明：直线1的方程(2m+1)x+(m+)y-7m-4=0,整理得2x+y-7=0(2x+y-7)m+(x+y-4)=0,此方程对于任意实数m成立，于是有x+y-4=0x=3解得所以直线I恒过定点D(3,):y=1....
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C.in favor of D.in connection with 27.A.recommended B.demanded C.requested D.insisted 28.A.benefits B.explanations C.problems D.choices 29.A.behaved B...
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