(1)10x²yz的3次方×(-2分之1xy的4次方)
=-5x³y的5次方z³
(2)(3分之1ab²-2ab)×2分之1ab
=1/6a平方b³-a²b²
(3)(x+3)²-(x-1)(x-2)
=x²+6x+9-x²+3x-2
=3x+7
(4)(x-2y+1)(x-2y-1)
=(x-2y)²-1²
=x²-4y+4y²-1
如果本题有什么不明白可以追问,
(1)10x²yz的3次方×(-2分之1xy的4次方)
=-5x³y的5次方z³
(2)(3分之1ab²-2ab)×2分之1ab
=1/6a平方b³-a²b²
(3)(x+3)²-(x-1)(x-2)
=x²+6x+9-x²+3x-2
=3x+7
(4)(x-2y+1)(x-2y-1)
=(x-2y)²-1²
=x²-4y+4y²-1
如果本题有什么不明白可以追问,