因式分解:1、[x(x²y²-xy)-y(x²-x³y)]÷3x²y.4(x+1)²-(2x+5)(2x-5)
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因式分解:1、[x(x²y²-xy)-y(x²-x³y)]÷3x²y.4(x+1)²-(2x+5)(2x-5)
因式分解:1、[x(x²y²-xy)-y(x²-x³y)]÷3x²y.
4(x+1)²-(2x+5)(2x-5)
因式分解:1、[x(x²y²-xy)-y(x²-x³y)]÷3x²y.4(x+1)²-(2x+5)(2x-5)
1、
=(x³y²-x²y-x²y+x³y²)÷3x²y
=(2x³y²-2x²y)÷3x²y
=2xy/3 -2/3
2)
=4(x²+2x+1)-(4x²-25)
=4x²+8x+4-4x²+25
=8x+29