6x²-7x=1=0 5x²-18=9x 4x²-3x=52 5x²=4-2x
来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/11/08 11:42:25
6x²-7x=1=0 5x²-18=9x 4x²-3x=52 5x²=4-2x
一定要用配方法 .
太密了、.6x²-7x+1=0 5x²-18=9x 4x²-3x=52 5x²=4-2x
一定要用配方法 .
太密了、.6x²-7x+1=0 5x²-18=9x 4x²-3x=52 5x²=4-2x
6x²-7x+1=0→x²-7x/6+1/6=0→[x²-7x/6+(7/12)²]-25/144=0→(x-7/12)²=25/144→x=±5/12+7/12即x=1或x=1/6;
5x²-18=9x→x²-9x/5-18/5=0→[x²-9x/5+(9/10)²]-441/100=0→(x-9/10)²=441/100→x=±21/10+9/10即x=3或x=-6/5;
4x²-3x=52→x²-3x/4-13=0→[x²-3x/4+(3/8)²]-841/64=0→(x-3/8)²=841/64→x=±29/8+3/8即x=4或x=-13/4;
5x²=4-2x→x²+2x/5-4/5=0→[x²+2x/5+(1/5)²]-21/25=0→(x+1/5)²=21/25→x=±√21/5-1/5即x=√21/5-1/5或x=-√21/5-1/5.
5x²-18=9x→x²-9x/5-18/5=0→[x²-9x/5+(9/10)²]-441/100=0→(x-9/10)²=441/100→x=±21/10+9/10即x=3或x=-6/5;
4x²-3x=52→x²-3x/4-13=0→[x²-3x/4+(3/8)²]-841/64=0→(x-3/8)²=841/64→x=±29/8+3/8即x=4或x=-13/4;
5x²=4-2x→x²+2x/5-4/5=0→[x²+2x/5+(1/5)²]-21/25=0→(x+1/5)²=21/25→x=±√21/5-1/5即x=√21/5-1/5或x=-√21/5-1/5.
x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?
4x²-{-3x²-[5x-x²-(2x²-x)]+4x},其中x=½
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
已知1+x+x^2+x^3=0,求x+x^2+x^3+x^4+x^5+x^6+x^7+x^8的值
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),
(1) x-3/x-2 - x-5/x-4=x-7/x-6 - x-9/x-8
x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x
求代数式的值 6x+2x²-3x+x²+1 其中x=-5 4x+3xy-x²-9 其中x=
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550
2x+3x+4x+5x+x+6x+7x=100
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