(2006•虹口区一模)方程组x+y=−5xy=6
(2012•虹口区二模)方程组x+y=1xy=−2
(2013•虹口区一模)设点P在曲线y=x2+2上,点Q在曲线y=x−2
(2012•虹口区一模)已知函数f(x)=sin(ωx+π4)
(2014•虹口区二模)椭圆x=acosφy=bsinφ
用换元法解方程组:(1)1/X+1/Y=5,(2)1/XY=6
(2014•虹口区一模)已知x:y=3:2,那么(x+y):x=______.
求方程组x+y=2xy−z
(2014•虹口区一模)函数f(x)=2sinπx与函数g(x)=3x−1
(2012•虹口区一模)已知sinα=13−cosα
(2010•虹口区一模)已知函数f(x)=sin2x−23cos2x+3,x∈[π4,π2].
(2010•虹口区一模)已知二次函数y=x2+2x-3,解答下列问题:
(2013•虹口区二模)已知函数y=2sin(x+π2)cos(x−π2)与直线y=12相交,若在y轴右侧的交点自左向右