已知X²-5XY+6Y²=0,求(X²+3XY)\2Y²的值
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已知X²-5XY+6Y²=0,求(X²+3XY)\2Y²的值
已知X²-5XY+6Y²=0,求(X²+3XY)\2Y²的值
已知X²-5XY+6Y²=0,求(X²+3XY)\2Y²的值
(X-3Y)(X-2Y)=0
1) X=3Y
(X^2+3XY)/2Y^2
=(9Y^2+9Y^2)/2Y^2=9
2) X=2Y
原式=(4Y^2+6Y^2)/2Y^2=5
因式分解=(X-2Y)*(X-3Y)=0
X=2Y或X=3Y带入原式=5或9
(x-2y)(x-3y)=0, x(x+3y)
-------- 把x=2y或x=3y代入计算得:1×5=5或3×3=9
yy