整式的乘法帮帮1(5x^2-7x+4)(7x-6) 2 (2x-1)(4x^2+2x+1) 3 (a+b-c)(a-b-c) 4 (2x-3y-z)(2x-3y+z) 5 (x-3)(x+3)(x^2+9) 6 (x-y)^3+(x+y)^3
问题描述:
整式的乘法帮帮
1(5x^2-7x+4)(7x-6)
2 (2x-1)(4x^2+2x+1)
3 (a+b-c)(a-b-c)
4 (2x-3y-z)(2x-3y+z)
5 (x-3)(x+3)(x^2+9)
6 (x-y)^3+(x+y)^3
答
4、4x^2-12xy+9x^2-z^2
答
35x^3-47x^2+70x-24
8x^3-1
a^2-b^2+c^2-2ac
4x^2+9y^2-z^2-12xy
x^4-81
2x^3+6xy^2