若x^2+xy=3,xy+y^2=-2,则2x^2-xy-3y^2的值为多少?详细步骤
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若x^2+xy=3,xy+y^2=-2,则2x^2-xy-3y^2的值为多少?详细步骤
若x^2+xy=3,xy+y^2=-2,则2x^2-xy-3y^2的值为多少?
详细步骤
若x^2+xy=3,xy+y^2=-2,则2x^2-xy-3y^2的值为多少?详细步骤
x² + xy = 3
两边同时乘以 2 得:
2x² + 2xy = 6 ①
xy + y² = -2
两边同时乘以 3 得:
3xy + 3y² = -6 ②
① - ② 得:
2x² - xy - 3y² = 12
x2 + xy = 3
两边同时乘以 2 得:
2x2 + 2xy = 6 ①
xy + y2 = -2
两边同时乘以 3 得:
3xy + 3y2 = -6 ②
① - ② 得:
2x2 - xy - 3y2 = 12
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