高考问答鼓词陈春兰玉蜻蜓8:化简~~~~~
来源：百度文库 编辑：高考问答 时间：2024/04/26 05:06:58
(-5x^3)(-2x²)(1/2)x^4-(2)x^4(-0.5x)^5
(a-2b+c)(a+2b-c)
(a-2b+c)(a+2b-c)
1.
(-5x^3)(-2x²)(1/2)x^4-(2)x^4(-0.5x)^5
=(-5)(-2)(1/2)x^3*x^2*x^4-(2)(-0.5)^5*x^4*x^5
=5x^9+1/16*x^9
=81x^9/16
2.
(a-2b+c)(a+2b-c)
=(a-(2b-c))(a+(2b-c))
=a^2-(2b-c)^2
=a^2-4b^2-c^2+4bc