解不等式:(2x-3)(x+4)-(x+2)(x-2)>x^2+7解不等式:(2x-3)(x+4)-(x+2)(x-2)>x^2+7已知x^2-3x+1=0,计算下列算式的值:2x^3-3x^2-7x+2014已知xy/x+y=2,yz/y+z=4,zx/z+x=3,求7x+5y-2z的值
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/17 20:58:13
![解不等式:(2x-3)(x+4)-(x+2)(x-2)>x^2+7解不等式:(2x-3)(x+4)-(x+2)(x-2)>x^2+7已知x^2-3x+1=0,计算下列算式的值:2x^3-3x^2-7x+2014已知xy/x+y=2,yz/y+z=4,zx/z+x=3,求7x+5y-2z的值](/uploads/image/z/6920087-23-7.jpg?t=%E8%A7%A3%E4%B8%8D%E7%AD%89%E5%BC%8F%EF%BC%9A%EF%BC%882x-3%29%28x%2B4%29-%28x%2B2%29%28x-2%29%3Ex%5E2%2B7%E8%A7%A3%E4%B8%8D%E7%AD%89%E5%BC%8F%EF%BC%9A%EF%BC%882x-3%29%28x%2B4%29-%28x%2B2%29%28x-2%29%3Ex%5E2%2B7%E5%B7%B2%E7%9F%A5x%5E2-3x%2B1%3D0%2C%E8%AE%A1%E7%AE%97%E4%B8%8B%E5%88%97%E7%AE%97%E5%BC%8F%E7%9A%84%E5%80%BC%EF%BC%9A2x%5E3-3x%5E2-7x%2B2014%E5%B7%B2%E7%9F%A5xy%2Fx%2By%3D2%2Cyz%2Fy%2Bz%3D4%2Czx%2Fz%2Bx%3D3%2C%E6%B1%827x%2B5y-2z%E7%9A%84%E5%80%BC)
解不等式:(2x-3)(x+4)-(x+2)(x-2)>x^2+7解不等式:(2x-3)(x+4)-(x+2)(x-2)>x^2+7已知x^2-3x+1=0,计算下列算式的值:2x^3-3x^2-7x+2014已知xy/x+y=2,yz/y+z=4,zx/z+x=3,求7x+5y-2z的值
解不等式:(2x-3)(x+4)-(x+2)(x-2)>x^2+7
解不等式:(2x-3)(x+4)-(x+2)(x-2)>x^2+7
已知x^2-3x+1=0,计算下列算式的值:2x^3-3x^2-7x+2014
已知xy/x+y=2,yz/y+z=4,zx/z+x=3,求7x+5y-2z的值
解不等式:(2x-3)(x+4)-(x+2)(x-2)>x^2+7解不等式:(2x-3)(x+4)-(x+2)(x-2)>x^2+7已知x^2-3x+1=0,计算下列算式的值:2x^3-3x^2-7x+2014已知xy/x+y=2,yz/y+z=4,zx/z+x=3,求7x+5y-2z的值
解不等式:(2x-3)(x+4)-(x+2)(x-2)>x^2+7
2x²+8x-3x-12-x²+4>x²+7;
5x>15;
x>3;
已知x^2-3x+1=0,计算下列算式的值:
2x^3-3x^2-7x+2014
=2x(x²-3x)+3x²-7x+2014
=2x×(-1)+3x²-7x+2014
=3x²-9x+2014
=3(x²-3x)+2014
=-3+2014
=2011;
已知xy/x+y=2,
1/x+1/y=1/2;
yz/y+z=4,
1/y+1/z=1/4;
zx/z+x=3,
1/z+1/x=1/3;
1/x-1/y=1/12;
2/x=7/12;
x=24/7;
y=24/5;
z=24;
7x+5y-2z
=24+24-48
=0;
手机提问的朋友在客户端右上角评价点【满意】即可.