(1)3x^2-[7x-(4x-3)-2x^2](2)(2xy-y)-(-y+yx)(3)5(a^2b-3ab^2)-2(a^2b-7ab^2)(4)11x^2+4x-1-x^2-4x-5(5)(2x^4-4x^3y-2x^2y^2)-(x^4-2x^2y^2+y^3)+(-x^4+4x^3y-y^3)注:x^2表示x的2次方,x^4表示x的4次方.
来源:学生作业帮助网 编辑:作业帮 时间:2024/08/13 18:48:46
![(1)3x^2-[7x-(4x-3)-2x^2](2)(2xy-y)-(-y+yx)(3)5(a^2b-3ab^2)-2(a^2b-7ab^2)(4)11x^2+4x-1-x^2-4x-5(5)(2x^4-4x^3y-2x^2y^2)-(x^4-2x^2y^2+y^3)+(-x^4+4x^3y-y^3)注:x^2表示x的2次方,x^4表示x的4次方.](/uploads/image/z/3999759-15-9.jpg?t=%281%293x%5E2-%5B7x-%284x-3%29-2x%5E2%5D%282%29%282xy-y%29-%28-y%2Byx%29%283%295%28a%5E2b-3ab%5E2%29-2%28a%5E2b-7ab%5E2%29%284%2911x%5E2%2B4x-1-x%5E2-4x-5%285%29%282x%5E4-4x%5E3y-2x%5E2y%5E2%29-%28x%5E4-2x%5E2y%5E2%2By%5E3%29%2B%28-x%5E4%2B4x%5E3y-y%5E3%29%E6%B3%A8%3Ax%5E2%E8%A1%A8%E7%A4%BAx%E7%9A%842%E6%AC%A1%E6%96%B9%2Cx%5E4%E8%A1%A8%E7%A4%BAx%E7%9A%844%E6%AC%A1%E6%96%B9.)
(1)3x^2-[7x-(4x-3)-2x^2](2)(2xy-y)-(-y+yx)(3)5(a^2b-3ab^2)-2(a^2b-7ab^2)(4)11x^2+4x-1-x^2-4x-5(5)(2x^4-4x^3y-2x^2y^2)-(x^4-2x^2y^2+y^3)+(-x^4+4x^3y-y^3)注:x^2表示x的2次方,x^4表示x的4次方.
(1)3x^2-[7x-(4x-3)-2x^2]
(2)(2xy-y)-(-y+yx)
(3)5(a^2b-3ab^2)-2(a^2b-7ab^2)
(4)11x^2+4x-1-x^2-4x-5
(5)(2x^4-4x^3y-2x^2y^2)-(x^4-2x^2y^2+y^3)+(-x^4+4x^3y-y^3)
注:x^2表示x的2次方,x^4表示x的4次方.
(1)3x^2-[7x-(4x-3)-2x^2](2)(2xy-y)-(-y+yx)(3)5(a^2b-3ab^2)-2(a^2b-7ab^2)(4)11x^2+4x-1-x^2-4x-5(5)(2x^4-4x^3y-2x^2y^2)-(x^4-2x^2y^2+y^3)+(-x^4+4x^3y-y^3)注:x^2表示x的2次方,x^4表示x的4次方.
俺不是高手,俺问问是因式分解么?
(1)3x^2-[7x-(4x-3)-2x^2]
=3x^2-7x+4x-3+2x^2
=5x^2-3x-3
(2)(2xy-y)-(-y+yx)
=2xy-y+y-xy
=xy
(3)5(a^2b-3ab^2)-2(a^2b-7ab^2)
=5a^2b-15ab^2-2a^2b+14ab^2
=3a^2b-ab^2
(4)11x^2+4x-1-x^2-4x-5
=10x^2-6
(5)(2x^4-4x^3y-2x^2y^2)-(x^4-2x^2y^2+y^3)+(-x^4+4x^3y-y^3)
=2x^4-4x^3y-2x^2y^2-x^4+2x^2y^2-y^3-x^4+4x^3y-y^3
=-2y^3
看不懂
什么“x^2表示x的2次方,x^4表示x的4次方”