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数学
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[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]÷4x.
人气:488 ℃ 时间:2019-12-19 10:24:08
解答
原式=[(9x
2
-4y
2
)-(5x
2
+8xy-4y
2
)]÷4x
=(4x
2
-8xy)÷4x
=x-2y.
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先化简再求值:[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]÷(4x),其中x=2,y=1.
[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]÷4x.
((5x+2y)(3x+2y)+(x-2y)(x+2y))*4x 其中x=2 y=3
[(5x+2y)(3x+2y)+(x+2y)(x-2y)]除以4x
已知x-2y=2011,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]÷4x的值.
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