几道数学题,化简.3a^b-[2ab-2(a^2b+2ab^2)]x(-6x-9)-x(-8x-15)+2X(3-X)7X^3Y^2/[(-7X^5Y^3)/(-1/3X^3Y^2)]

几道数学题,化简.3a^b-[2ab-2(a^2b+2ab^2)]x(-6x-9)-x(-8x-15)+2X(3-X)7X^3Y^2/[(-7X^5Y^3)/(-1/3X^3Y^2)]
几道数学题,化简.
3a^b-[2ab-2(a^2b+2ab^2)]
x(-6x-9)-x(-8x-15)+2X(3-X)
7X^3Y^2/[(-7X^5Y^3)/(-1/3X^3Y^2)]

几道数学题,化简.3a^b-[2ab-2(a^2b+2ab^2)]x(-6x-9)-x(-8x-15)+2X(3-X)7X^3Y^2/[(-7X^5Y^3)/(-1/3X^3Y^2)]
3a^b-[2ab-2(a^2b+2ab^2)]
=3a²b-（2ab-2a²b-2ab²)
=3a²b-2ab+2a²b+2ab²
=5a²b+2ab²-2ab
x(-6x-9)-x(-8x-15)+2X(3-X)
=-6x²-9x+8x²+15x+6x-2x²
=12x
7X^3Y^2/[(-7X^5Y^3)/(-1/3X^3Y^2)]
=7x³y²/（-7x^5y³）*（-1/3x³y²）
=1/3xy²

3a^b-[2ab-2(a^2b+2ab^2)]
=3a^b-[2ab-2a^2b-4ab^2]
=3a^b-2ab+2a^2b+2ab^2
x(-6x-9)-x(-8x-15)+2X(3-X)
=-6x^2-9x+8x^2+15x+6x-2x^2
=12x
7X^3Y^2/[(-7X^5Y^3)/(-1/3X^3Y^2)]
=7X^3Y^2/[21x^2y]
=1/3xy

首先 你这里的^是什么运算法则啊 如果是 平方 那么第一个人回答的对 如果是其他的法则 那就是第二人说的对