0.8:5/13=(5-x):0.25 4/13×(5-x)=0.8×0.25
求1/2x^2-1/4x+0.2x^3+0.25x-0.5x^2-1/5x^3+0.5x-1 其中x=12/13
(1) x-3/x-2 - x-5/x-4=x-7/x-6 - x-9/x-8
3/x-1=4/x 6/x+1=x+5/x(x+1)
f(x)=5x^5+2x^4+3.5x^3-2.6x^2+1.7x-0.8,用秦九韶法计算多项式当x=5时
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550
(x/x-1)+(5x-2)/x*x-x=1 求x(有图)
(先化简后求值)(3x/x+2-x/x-2)+2x/x^2-4,x=4-根号5,
解方程(14X-13)*(5X+13)-14X*5X=182
(5x*0.85+9(66-x)*0.8)/(5x+9(66-x))=1-0.18
解方程.3(x+2)=4(x+1) 0.8x-0.6x+1.6x=5.4 8:5+x/4=4
解方程 1.2x+0.8x=12.6 8x(5x-1.2)=20.4
5x/(x+3)(x+2)+(2x-5)/(x-4)(x+3)=(7x-70)/(x+2)(x+4)