5*4x+x*x=80
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5*4x+x*x=805*4x+x*x=805*4x+x*x=80哈哈5*4x+x*x=80x²+20x-80=0x²+20x+100-100-80=0(x+10)²-1
5*4x+x*x=80
5*4x+x*x=80
5*4x+x*x=80
哈哈
5*4x+x*x=80
x²+20x-80=0
x²+20x+100-100-80=0
(x+10)²-180=0
(x+10-6√5)(x+10+6√5)=0
x=-10+6√5或x=-10-6√5
5*4x+x*x=80
x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?
*-----------------------------------------------*| 6 4 X | 8 X X | X X 5 || X X X | X X X | X 7 8 || X X X | X X X | X X X ||---------------+---------------+--------------- || X X X | X X X | 5 1 X || X X X | X 6 X | X X X || 8 X X | 3 5 X | 2 X X ||
x-2x+3x-4x+5x.+99x-100x=25求解
2x+3x+4x+5x+x+6x+7x=100
(x-3/x-2)-(x-2/x-1)=(x-5/x4) -(x-4/x-3)
x(x+1)+(x+2)+(x+3)+(x+4)+(x+5) = 27求x
x-4/x-5 - x-5/x-6=x-7/x-8 - x-8/x-9求x=?
提取公因式:已知x*x-5x+1=0 求x*x*x-4x*x-4x-1
x+2/x+1-x+4/x+3=x+6/x+5-x+8/x+7 x=?
x^-6x+5=x+4
y=|-x.x+4x+5|
写过程x(x-1)+2x(x+1)-3x(2x-5)-x(3x-2)+2x(2-x)=-5x(x-2)-4
4（x+5）+8x=80x=?
解x-2/5x+8=80%x-4
求（X+X+5)乘4=7X+80,
(3x-5)*(4x-3)=80 求x
(x+3)(x-4)(x+5)(x-6)+80因式分解