(1) x²-(x³y-2x²y²)÷xy (2) (1-1/2)(1+1/2)(1+1/4)(1+1/16)
(3)(2x-3y)²-(y+3x)(3x-y)(4)(2a³b²-4a的四次方b³+6a的五次方b的四次方)÷(-2a³...
(3) (2x-3y)²-(y+3x)(3x-y) (4) (2a³b²-4a的四次方b³+6a的五次方b的四次方)÷(-2a³b²)
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(1) x²-(x³y-2x²y²)÷xy
=x²-x²+2xy
=+2xy
(2) (1-1/2)(1+1/2)(1+1/4)(1+1/16)
=(1-1/4)(1+1/4)(1+1/16)
=(1-1/16)(1+1/16)
=1-1/256
=255/256
(3) (2x-3y)²-(y+3x)(3x-y)
=4x²-12xy+9y²-9x²+y²
=-5x²-12xy+10y²
(4) (2a³b²-4a的四次方b³+6a的五次方b的四次方)÷(-2a³b²)
=-1+2ab-3a²b²
=(-1+3a)(1-a)
=(3a-1)(1-a)
=x²-x²+2xy
=+2xy
(2) (1-1/2)(1+1/2)(1+1/4)(1+1/16)
=(1-1/4)(1+1/4)(1+1/16)
=(1-1/16)(1+1/16)
=1-1/256
=255/256
(3) (2x-3y)²-(y+3x)(3x-y)
=4x²-12xy+9y²-9x²+y²
=-5x²-12xy+10y²
(4) (2a³b²-4a的四次方b³+6a的五次方b的四次方)÷(-2a³b²)
=-1+2ab-3a²b²
=(-1+3a)(1-a)
=(3a-1)(1-a)
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