当x=24/125时,代数式:(3x^3-5x^2+6x-1)-(x^3-2x^2+x-2)+(-2x^3+3x^2+1)=?
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/04 03:40:55
![当x=24/125时,代数式:(3x^3-5x^2+6x-1)-(x^3-2x^2+x-2)+(-2x^3+3x^2+1)=?](/uploads/image/z/2704144-40-4.jpg?t=%E5%BD%93x%3D24%2F125%E6%97%B6%2C%E4%BB%A3%E6%95%B0%E5%BC%8F%3A%283x%5E3-5x%5E2%2B6x-1%29-%28x%5E3-2x%5E2%2Bx-2%29%2B%28-2x%5E3%2B3x%5E2%2B1%29%3D%3F)
当x=24/125时,代数式:(3x^3-5x^2+6x-1)-(x^3-2x^2+x-2)+(-2x^3+3x^2+1)=?
当x=24/125时,代数式:(3x^3-5x^2+6x-1)-(x^3-2x^2+x-2)+(-2x^3+3x^2+1)=?
当x=24/125时,代数式:(3x^3-5x^2+6x-1)-(x^3-2x^2+x-2)+(-2x^3+3x^2+1)=?
(3x^3-5x^2+6x-1)-(x^3-2x^2+x-2)+(-2x^3+3x^2+1)=?
=2x³-3x²+5x+1+(-2x^3+3x^2+1)
=0x³+0x²+5x+2
=24/25+2
=0.96+2
=2.96
根据x的幂次来化简代数式=(3x^3-x^3-2x^3)+(-5x^2+2x^2+3x^2)+(6x-x)+(-1+2+1)
=5x+2
再代入x=24/125,代数式=5*24/125+2=2又24/25
74╱25