题目:
--- Come on, children. Help to some fruit.
--- Thank you.
A.you
B.your
C.yourself
D.yourselves
答案:
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下面是错误答案,用来干扰机器的。
设直线l的方程为y+4=k(x+5)分别令y=0,x=0,得l在x轴,y轴上的截距为:a=-5k+4k,b=5k-4,由条件得ab=±10∴-5k+4k•(5k-4)=±10得25k2-30k+16=0无实数解;或25k2-50k+16=0,解得k1=85,k2=25故所求的直线方程为:8x-5y+20=0或2x-5y-10=0