标题: help!!! 2 math question [打印本页] 作者: wusagi 时间: 2002-12-23 09:48 标题: help!!! 2 math question
1.(y+3)(y-1)-(y-2)(y-1)=r(y-1) y=? 1)r=5 2)Y=r
2.有一线平行于X=Y, 不在II象限,有一点A(r,o), 一点B(s,t), 且rst相乘不等于零,问三角形OAB面积?
1) r=3
2) t=-6
how about this 2 question???
gonna go fighting ...please help !!![em24]作者: 猫猫头 时间: 2002-12-23 12:11
mm
but 5-r)(y-1)=0 ==> y=r=5 or y=1=r , when y=1 , r could be any number. but ask for y=r, then you can be y=r=1, so y could be 1 or 5 .
so is the answer is C作者: 猫猫头 时间: 2002-12-23 17:26
那就是C啦
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