化简代数式的几道题3(x-1)-(x-5)2(x^2-y^2)-3(x^2-2y^2)(x+y)+3(x-y)-4(x+y-2)(2x^2-1+3x)-4(x-x^2+1)-3a^2+(3a-5a^2)-1/2(4a^2+6a)(8mn-3m^2)-5mn-2(3mn-2m^2)3(2x^2-y^2)-2(3y^2-2x^2)(8x^3-3x^2+3)-(9x^3-4x^2+5)-(-4ab+b^2)-2(2ab-b^2)辛苦了.
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/04 04:29:10
![化简代数式的几道题3(x-1)-(x-5)2(x^2-y^2)-3(x^2-2y^2)(x+y)+3(x-y)-4(x+y-2)(2x^2-1+3x)-4(x-x^2+1)-3a^2+(3a-5a^2)-1/2(4a^2+6a)(8mn-3m^2)-5mn-2(3mn-2m^2)3(2x^2-y^2)-2(3y^2-2x^2)(8x^3-3x^2+3)-(9x^3-4x^2+5)-(-4ab+b^2)-2(2ab-b^2)辛苦了.](/uploads/image/z/1116647-71-7.jpg?t=%E5%8C%96%E7%AE%80%E4%BB%A3%E6%95%B0%E5%BC%8F%E7%9A%84%E5%87%A0%E9%81%93%E9%A2%983%28x-1%29-%28x-5%292%28x%5E2-y%5E2%29-3%28x%5E2-2y%5E2%29%28x%2By%29%2B3%28x-y%29-4%28x%2By-2%29%282x%5E2-1%2B3x%29-4%28x-x%5E2%2B1%29-3a%5E2%2B%283a-5a%5E2%29-1%2F2%284a%5E2%2B6a%29%288mn-3m%5E2%29-5mn-2%283mn-2m%5E2%293%282x%5E2-y%5E2%29-2%283y%5E2-2x%5E2%29%288x%5E3-3x%5E2%2B3%29-%289x%5E3-4x%5E2%2B5%29-%28-4ab%2Bb%5E2%29-2%282ab-b%5E2%29%E8%BE%9B%E8%8B%A6%E4%BA%86.)
化简代数式的几道题3(x-1)-(x-5)2(x^2-y^2)-3(x^2-2y^2)(x+y)+3(x-y)-4(x+y-2)(2x^2-1+3x)-4(x-x^2+1)-3a^2+(3a-5a^2)-1/2(4a^2+6a)(8mn-3m^2)-5mn-2(3mn-2m^2)3(2x^2-y^2)-2(3y^2-2x^2)(8x^3-3x^2+3)-(9x^3-4x^2+5)-(-4ab+b^2)-2(2ab-b^2)辛苦了.
化简代数式的几道题
3(x-1)-(x-5)
2(x^2-y^2)-3(x^2-2y^2)
(x+y)+3(x-y)-4(x+y-2)
(2x^2-1+3x)-4(x-x^2+1)
-3a^2+(3a-5a^2)-1/2(4a^2+6a)
(8mn-3m^2)-5mn-2(3mn-2m^2)
3(2x^2-y^2)-2(3y^2-2x^2)
(8x^3-3x^2+3)-(9x^3-4x^2+5)
-(-4ab+b^2)-2(2ab-b^2)
辛苦了.
化简代数式的几道题3(x-1)-(x-5)2(x^2-y^2)-3(x^2-2y^2)(x+y)+3(x-y)-4(x+y-2)(2x^2-1+3x)-4(x-x^2+1)-3a^2+(3a-5a^2)-1/2(4a^2+6a)(8mn-3m^2)-5mn-2(3mn-2m^2)3(2x^2-y^2)-2(3y^2-2x^2)(8x^3-3x^2+3)-(9x^3-4x^2+5)-(-4ab+b^2)-2(2ab-b^2)辛苦了.
解
3(x-1)-(x-5)
=3x-3-x+5
=(3x-x)+(5-3)
=2x+2
2(x²-y²)-3(x²-2y²)
=(2x²-3x²)+(-2y²+6y²)
=4y²-x²
(x+y)+3(x-y)-4(x+y-2)
=(x+3x-4x)+(y-3y-4y)+8
=-6y+8
(2x^2-1+3x)-4(x-x^2+1)
=(2x²+4x²)+(3x-4x)+(-1-4)
=6x²-x-5
-3a^2+(3a-5a^2)-1/2(4a^2+6a)
=(-3a²-5a²-2a²)+(3a-3a)
=-10a²
(8mn-3m^2)-5mn-2(3mn-2m^2)
=(8mn-5mn-6mn)+(-3m²+4m²)
=-3mn+m²
3(2x^2-y^2)-2(3y^2-2x^2)
=(6x²+4x²)+(-6y²-3y²)
=10x²-9y²
(8x^3-3x^2+3)-(9x^3-4x^2+5)
=(8x³-9x³)+(-3x²+4x²)+(3-5)
=-x³+x²-2
-(-4ab+b^2)-2(2ab-b^2)
=4ab-b²-4ab+2b²
=b²
直接乘法分配律,完了就直接加减了。
这么简单,,,你多大了,,,