先计算,再求值:(4x²-3xy+y²)(4x²+3xy+y²),求x=1/2,
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先计算,再求值:(4x²-3xy+y²)(4x²+3xy+y²),求x=1/2,y=2时代数式的值?
好的有加分哦!
好的有加分哦!
![先计算,再求值:(4x²-3xy+y²)(4x²+3xy+y²),求x=1/2,](/uploads/image/z/18973633-49-3.jpg?t=%E5%85%88%E8%AE%A1%E7%AE%97%2C%E5%86%8D%E6%B1%82%E5%80%BC%EF%BC%9A%284x%26sup2%3B-3xy%2By%26sup2%3B%29%284x%26sup2%3B%2B3xy%2By%26sup2%3B%EF%BC%89%2C%E6%B1%82x%3D1%2F2%2C)
原式=[(4x²+y²)-3xy][(4x²+y²)+3xy]
=(4x²+y²)²-(3xy)²
=16x^4+8x²y²+y^4-9x²y²
=16x^4-x²y²+y^4
=1-1+16
=16
=(4x²+y²)²-(3xy)²
=16x^4+8x²y²+y^4-9x²y²
=16x^4-x²y²+y^4
=1-1+16
=16
先化简,再求值:3xy²(-x²y+2x³y²)-4xy(-xy²)·
计算:(1).(-2xy²)*(3x²y)²
①先化简,再求值.4(3x²y—1/2xy²)—5(—xy²+3x²y),其中x
已知2x²-3y²=xy,(xy≠0),求值(4xy-x²)/(xy+2y²)的
3x²-4xy+y²
先化简 再求值.4x²-8xy+4y²/ 2x²-2y² 其中 x=2 y=3
1 3x²+4xy-y²=
已知x-2y=3,x²-2xy+4y²=11,求①xy ②x²y-2xy²
已知x/y=3,求x²+2xy-3y²/x²-2xy+y²
已知x/y=3,求x²+2xy-3y²/x²-xy+y²的值
x/y=2,求分式x²-xy+3y²/x²+xy+6y²
|x+2y+3|+(2x+y)²=0求x²-xy+y²