(1)(x+2y-3)(x-2y+3) (2)[x(x²y²-xy)-y(x²-x³y)]÷3x²y (3)3(y-z)²-(2y+z)(-z+2y) (4)4(x+1)²-(2x+5)(2x-5)
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(1)(x+2y-3)(x-2y+3) (2)[x(x²y²-xy)-y(x²-x³y)]÷3x²y (3)3(y-z)²-(2y+z)(-z+2y) (4)4(x+1)²-(2x+5)(2x-5)