3)(3x²y-xy²+2xy)÷二分之一xy 4) (x-3)×(x+3)-(x+10×(x+3)
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![3)(3x²y-xy²+2xy)÷二分之一xy 4) (x-3)×(x+3)-(x+10×(x+3)](/uploads/image/z/1730660-68-0.jpg?t=3%EF%BC%89%EF%BC%883x%26%23178%3By-xy%26%23178%3B%2B2xy%29%C3%B7%E4%BA%8C%E5%88%86%E4%B9%8B%E4%B8%80xy+4%29+%28x-3%29%C3%97%EF%BC%88x%2B3%EF%BC%89-%EF%BC%88x%2B10%C3%97%EF%BC%88x%2B3%EF%BC%89)
3)(3x²y-xy²+2xy)÷二分之一xy 4) (x-3)×(x+3)-(x+10×(x+3)
3)(3x²y-xy²+2xy)÷二分之一xy 4) (x-3)×(x+3)-(x+10×(x+3)
3)(3x²y-xy²+2xy)÷二分之一xy 4) (x-3)×(x+3)-(x+10×(x+3)
3)(3x²y-xy²+2xy)÷二分之一xy
=6x-2y+4
4) (x-3)×(x+3)-(x+10)×(x+3)
=x*x-9-x*x-13x-30
=-13x-39