已知x的平方减7xy加12y的平方等于零求x加2y分之x减y
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X - SUP2; -7xy + 12Y² =(X-4Y)(X-3Y)= 0
X = 1613或x = 1411
X = 1613时
(X SUP2; -xy + Y&SUP2)/ 2XY
=(16-4 +1)Y² / 8Y²
= 13/8
X = 1411时
(X SUP2; -xy + Y&SUP2)/ 2XY
=(9-3 +1)Y&SUP2 ; / 6Y²
= 7/6
2XY每平方-xy + YX值2.63或7/6
X = 1613或x = 1411
X = 1613时
(X SUP2; -xy + Y&SUP2)/ 2XY
=(16-4 +1)Y² / 8Y²
= 13/8
X = 1411时
(X SUP2; -xy + Y&SUP2)/ 2XY
=(9-3 +1)Y&SUP2 ; / 6Y²
= 7/6
2XY每平方-xy + YX值2.63或7/6
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