用平方差公式公式:1、(3x-1/2)(-1/2-3x)(-1/4-9x²)化简求值:1、(x+3)(x-3)-x(x-2),其中x=4、2、(3x²-2y²)(-2y²-3x²)+3(x²-y²)(x²+y²),其中x=1,y=-23、(1-2a)(1+2
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![用平方差公式公式:1、(3x-1/2)(-1/2-3x)(-1/4-9x²)化简求值:1、(x+3)(x-3)-x(x-2),其中x=4、2、(3x²-2y²)(-2y²-3x²)+3(x²-y²)(x²+y²),其中x=1,y=-23、(1-2a)(1+2](/uploads/image/z/759907-19-7.jpg?t=%E7%94%A8%E5%B9%B3%E6%96%B9%E5%B7%AE%E5%85%AC%E5%BC%8F%E5%85%AC%E5%BC%8F%EF%BC%9A1%E3%80%81%EF%BC%883x-1%2F2%29%28-1%2F2-3x%29%28-1%2F4-9x%26%23178%3B%29%E5%8C%96%E7%AE%80%E6%B1%82%E5%80%BC%EF%BC%9A1%E3%80%81%EF%BC%88x%2B3%EF%BC%89%EF%BC%88x-3%EF%BC%89-x%28x-2%29%2C%E5%85%B6%E4%B8%ADx%3D4%E3%80%812%E3%80%81%EF%BC%883x%26%23178%3B-2y%26%23178%3B%EF%BC%89%EF%BC%88-2y%26%23178%3B-3x%26%23178%3B%EF%BC%89%2B3%EF%BC%88x%26%23178%3B-y%26%23178%3B%EF%BC%89%EF%BC%88x%26%23178%3B%2By%26%23178%3B%EF%BC%89%2C%E5%85%B6%E4%B8%ADx%3D1%2Cy%3D-23%E3%80%81%EF%BC%881-2a%EF%BC%89%281%2B2)
用平方差公式公式:1、(3x-1/2)(-1/2-3x)(-1/4-9x²)化简求值:1、(x+3)(x-3)-x(x-2),其中x=4、2、(3x²-2y²)(-2y²-3x²)+3(x²-y²)(x²+y²),其中x=1,y=-23、(1-2a)(1+2
用平方差公式公式:1、(3x-1/2)(-1/2-3x)(-1/4-9x²)
化简求值:1、(x+3)(x-3)-x(x-2),其中x=4、
2、(3x²-2y²)(-2y²-3x²)+3(x²-y²)(x²+y²),其中x=1,y=-2
3、(1-2a)(1+2a)(1+4a²)(1+16a四次方),其中a=-1/2
计算:1、(1/2x-2)(1/2x+2)+(-3+x)(-x-3)
2、(5x+3y)(3y-5x)-(4x-y)(4y+x)
3、(x-3y)(x²+9y²)(x+3y)
用平方差公式公式:1、(3x-1/2)(-1/2-3x)(-1/4-9x²)化简求值:1、(x+3)(x-3)-x(x-2),其中x=4、2、(3x²-2y²)(-2y²-3x²)+3(x²-y²)(x²+y²),其中x=1,y=-23、(1-2a)(1+2
1、(3x-1/2)(-1/2-3x)(-1/4-9x²)=-(3x-1/2)(3x+1/2)(-1/4-9x²)=(3x-1/2)(3x+1/2)(1/4+9x²)=(9x²)²-(1/4)²
1、(x+3)(x-3)-x(x-2)=x²-9-x²+2x=2x-9=-1
2、(3x²-2y²)(-2y²-3x²)+3(x²-y²)(x²+y²)=-(3x²)²+(2y²)²+3(x²)²-3(y²)²=(y²)²-6(x²)²=10
3、(1-2a)(1+2a)(1+4a²)(1+16a四次方)=(1-4a²)(1+4a²)(1+16a四次方)=(1-16a四次方)(1+16a四次方)=1-256a八次方=0
之后的计算类似,你应该学会自己多练习练习,这样才会进步!