若x-y=5,(x+y)²=3则x²+y²=?
3个回答
你好
(x-y)²+(x+y)²
=2x²+2y²
=2(x²+y²)
=25+9
=34
x²+y²=17
数学辅导团为您解答,不理解请追问,理解请及时选为满意回答!(*^__^*)谢谢!
相关问题
若3x=5y,则x:y=________,(x-y):y=______
若x/y=3/5,则x+y/x-y
若x-y=3,则-x+5+y=( )
若|x|=5,|y|=3,则|X+Y|=
若方程(x+y-5)²+|3x-y-3|=0,则x=________,y=________.
若5X-8Y=0,则X+3Y/X-3Y=
若x-y=1,x3-y3=2,则x4+y4=______,x5-y5______.
(5)若x/2=y/3(y不为0)则x/y=____,x+y/y=___,y/x-y=___.
若X:4=5:Y,则XY= ( );若5X=7Y,则X:Y= ( ):( ).
若(5x+2y-3)² + |3x+2y-5|=0,则2x+y=________________