若√7-x²=x-7,√x-13²=13-x.化简|6-x|+|x-14|
(x-2)(x-3)+2(x+6)(x-5)-3(x²-7x+13)化简
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550
求y=√(x²-6x+13)+√(x²+4x+5)及y=√(x²-6x+13)-√(x
0.3x²+x=0.8 x²+3=2√3x x²+2x-2=0 3x²+4x-7
已知√7x²+9x=13+√7x²-5x+13=7x,求x的值
x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?
用递归法求y=x-(x*x*x/3!)+(x*x*x*x*x/5!)-(x*x*x*x*x*x*x/7!)+.
18/2X+9=54/7x为什么x=27及为什么x√x²+2x+1被化简为x|x+1|.
解方程(x²-x+4)x-(x-1)(x²+2)=x+7
x²-x-6=0 x²+x-6=0 x²+7x+6=0 x²-7x+6=0 x&
解方程x²+x-6分之5x+x²-x-12分之2x-5=x²-6x+8分之7x-10
解方程.(5x/x²+x-6)+(2x-5/x²-x-12)=7x-10/x²-6x+8