4(x+1)²-(2x+5)(2x-5) 2x*(1/2x²-1)-3x(1/3x²+2/3)
3(y-z)²-(2y+z)(-z+2y)[x(x²y²-xy)-y(x²-x²-x³y)]除3x²...
3(y-z)²-(2y+z)(-z+2y) [x(x²y²-xy)-y(x²-x²-x³y)]除3x²y 全过程
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4(x+1)²-(2x+5)(2x-5)
=4(x²+2x+1)-(4x²-25)
=4x²+8x+4-4x²+25
=8x+29
2x*(1/2x²-1)-3x(1/3x²+2/3)
=x³-2x-x³-2x
=-4x
3(y-z)²-(2y+z)(-z+2y)
=3(y²-2yz+z²)-(4y²-z²)
=3y²-6yz+3z²-4y²+z²
=-y²-6yz+4z²
[x(x²y²-xy)-y( x²-x² -x³y)]除3x²y
=(x³y²-x²y+x³y²)÷3x²y
=2x/3-1/3
=4(x²+2x+1)-(4x²-25)
=4x²+8x+4-4x²+25
=8x+29
2x*(1/2x²-1)-3x(1/3x²+2/3)
=x³-2x-x³-2x
=-4x
3(y-z)²-(2y+z)(-z+2y)
=3(y²-2yz+z²)-(4y²-z²)
=3y²-6yz+3z²-4y²+z²
=-y²-6yz+4z²
[x(x²y²-xy)-y( x²-x² -x³y)]除3x²y
=(x³y²-x²y+x³y²)÷3x²y
=2x/3-1/3
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