1.(3a^2-5a+6)-3(-2a^2-2a+4)
来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/09/02 04:28:59
1.(3a^2-5a+6)-3(-2a^2-2a+4)
2.3a^2b-2[ab^2-2(a^2b-2ab^2)]
3.3a^2-[7b-(4a-b)-2a^2]
4.-7x^2+(6x^2-5xy)-2(3y^2+xy-x^2)
^2是的平方 不要错误答案
2.3a^2b-2[ab^2-2(a^2b-2ab^2)]
3.3a^2-[7b-(4a-b)-2a^2]
4.-7x^2+(6x^2-5xy)-2(3y^2+xy-x^2)
^2是的平方 不要错误答案
(1)(3a²-5a+6)-3(-2a²-2a+4)
=3a²-5a+6+6a²+6a-12
=9a²+a-6
(2)3a²b-[ab²-2(a²b-2ab²)]
=3a²b-[ab²-2a²b+4ab²]
=3a²b-[5ab²-2a²b]
=3a²b-5ab²+2a²b
=5a²b-5ab²
(3)3a²-[7b-(4a-b)-2a²]
=3a²-[7b-4a+b-2a²]
=3a²-[8b-4a-2a²]
=3a²-8b+4a+2a²
=5a²+4a-8b
(4)-7x²+(6x²-5xy)-2(3y²+xy-x²)
=-7x²+6x²-5xy-6y²-2xy+2x²
=x²-7xy-6y²
=3a²-5a+6+6a²+6a-12
=9a²+a-6
(2)3a²b-[ab²-2(a²b-2ab²)]
=3a²b-[ab²-2a²b+4ab²]
=3a²b-[5ab²-2a²b]
=3a²b-5ab²+2a²b
=5a²b-5ab²
(3)3a²-[7b-(4a-b)-2a²]
=3a²-[7b-4a+b-2a²]
=3a²-[8b-4a-2a²]
=3a²-8b+4a+2a²
=5a²+4a-8b
(4)-7x²+(6x²-5xy)-2(3y²+xy-x²)
=-7x²+6x²-5xy-6y²-2xy+2x²
=x²-7xy-6y²
计算:(a+3a+5a+...+2013a)-(2a+4a+6a+...+2012a)=?
计算:(a+3a+5a+…+2009a)-(2a+4a+6a+…+2010a)
5a-【a+(5a-2a)-2(a-3a)-4a】
(a+3a+5a+...+2009a)-(2a+4a+6a+...+2008a)=
(a+3a+ 5a+```+2007a)-(2a+4a+6a+```+2008a)=?
(a+3a+5a+...+2013a)-(2a+4a+6a+...+2012a)=
计算(a+3a+5a+.+2003a)-(2a+4a+6a+...+2004a)
(a+3a+5a+.+2003a)-(2a+4a+6a+.+2004a)
化简; a-2a+3a-4a+5a-6a+``````-2006a+2007a.
求和:1,a+a^2,a^3+a^4+a^5,a^6+a^7+a^8+a^9,···(a不等于0)
化简(—a^3+3a^2-7a+5)+(5a^-6a)-(a^3-4a+7)
a+a^2+a^3+a^4