Question

初一，数学题目

初一，数学题目求助，求助求助助，很急需，过程要写出来，写在草稿纸上拍给我，谢谢^ω^字写好看点\(//∇//)\

Answer 1

化简下列各式:

(1)5ax-4a^2 x^2-8ax^2+3ax-ax^2-4a^2 x^2
=5ax+3ax-(4a^2 x^2+4a^2 x^2)-(8ax+ax)
=8ax-8a^2 x^2-9ax^2

(2) 4xy-3y^2-3x^2+xy-3xy-2x^2-4y^2

=4xy-3xy+xy-(3y^2+4y^2)-(3x^2+2x^2)
=2xy-7y^2-5x^2
(3).3x^2 y-5xy^2+3xy^2+7x^2 y-2xy
=(3x^2 y+7x^2 y)+(-5xy^2+3xy^2)-2xy
=10x^2 y-2xy^2-2xy
(4).8a-a^3+a^2+4a^2-a^2-17a+2
=(8a-17a)-a^3+(a^2+4a^2-a^2)+2
=-a^3+4a^2-9a+2
(5) a^2-2ab+b^2-2a^2+2ab-4b^2
=(a^2-2a^2)+(-2ab+2ab)+(b^2-4b^2)
=-a^2-3b^2

2.合并同类项:
(1)3a^2+2ab^2+5-3a^2 b-5ab^2-2
=3a^2+(2ab^2-5ab^2)+(5-2)-3a^2 b
=3a^2-3ab^2-3a^2 b+3
(2). 4xy-3x^2-3xy-2y+2x^2

=(4xy-3xy)+(-3x^2+2x^2)-2y
=xy-x^2-2y
(3) 4a^2+3b^2+2ab-4a^2-6b^2
=(4a^2-4a^2)+(3b^2-6b^2)+2ab
=-3b^2+2ab
(4). 5x^2-7xy+3x^2+6xy-4x^2
=(5x^2+3x^2-4x^2)+(-7xy+6xy)
=4x^2-xy

追问

可以写纸上吗？谢谢