1/5+x=4/5 x-9/10=3/10 x+4/11+5/11=13/11
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550
1+2x+3x^2+4x^3+5x^4+6x^5+7x^6+8x^7+9x^8+10x^9+11x^10当x=-1时的值
y=(x-1)(x-2)(x-3)(x-4)(x-5)(x-6)(x-7)(x-8)(x-9)(x-10)的导数在x=1
设函数f(x)=(x-1)(x-2)(x-3)(x-4)(x-5)(x-6)(x-7)(x-8)(x-9)(x-10),
x的平方-2x+1=15 ; x(2x-5)=4x-10 ; x的平方+5x+7=3x=11
1x()+2x()+3x()+4x()+5x()+6x()+7x()+8x()加9x()+10x()=1980
1X?+2X?+3X?+4X?+5X?+6X?+7X?+8X?+9X?+10X?=1980求?是多少
2x平方+3x=3 (用配方) x(2x-5)=4x-10 x平方+5x+7=3x+11 1-8x+16x平方=2-8x
解方程:11(6-x)/3(x-4)=10(5-x)/3(x-4)-5(6-x)/x-2
x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x
计算:1/(x^2-7x+10)+1/(x^2-x-2)+1/(x^2+5x+4)+1/(x^2+11x+28)=( )
3X-根号2=2X+1(精确到0.01) 11-X=10X 4X-3=2X-9 5+四分之1X=2分之1X-4 0.8X