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)
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
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