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19.解:(1) y=-1/2x+24 ,令x=0,得y=2; 令y=0.得 -1/2x+2=0 .解得x=4.所以A(4,0). B(0,2). 所以OA =4. 因为P(m.n)在直线 y=-1/2x+2 上, 所以 n=-1/2m+2 . 因为点P(m,n)在第一象限内,即m0,n0, 所以0m4. S=1/2OA⋅n=-m+4(0m4) .(4分) (2)将S =...
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