(1)若x+y=5,x^2+y^2=37(2)若x-y=5,xy=4分之11,求x+y
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(1)若x+y=5,x^2+y^2=37(2)若x-y=5,xy=4分之11,求x+y
1)若x+y=5,x^2+y^2=37,求xy(2)若x-y=5,xy=4分之11,求x+y
1)若x+y=5,x^2+y^2=37,求xy(2)若x-y=5,xy=4分之11,求x+y
(1)若x+y=5,x^2+y^2=37,x^2+2xy+y^2=25,2xy+37=25,xy=-6.
(2)若x-y=5,xy=4分之11,(x+y)^2=x^2-2xy+y^2+4xy=(x-y)^2+4xy=25+11=36.
x+y=6或-6.
再问: 第一题2xy怎么求?
再答: 你看呀,我的解答已经写的很清楚了:x^2+2xy+y^2=25, 2xy+37=25, 2xy=25-37=-12, xy=-6.
(2)若x-y=5,xy=4分之11,(x+y)^2=x^2-2xy+y^2+4xy=(x-y)^2+4xy=25+11=36.
x+y=6或-6.
再问: 第一题2xy怎么求?
再答: 你看呀,我的解答已经写的很清楚了:x^2+2xy+y^2=25, 2xy+37=25, 2xy=25-37=-12, xy=-6.
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