5%x+40%(140-x)=42
5x÷8-3x=40 7x-8=42+3x 9x+7-3x=9x-3
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!)+.
解方程5x+2x+3x+8x+6x=140-x-3x
x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x
13x+42-5x=104-12x-22
4x+5x+14=42-2(x+3)
(X/80+X/100 +5)*40=X,
x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?
解方程X-1/5X=24 X-1/8X=42 X-1/9X=64
5/9X+X=42
帮我解方程95+5%x=x 700-40%x=x 60-20%x=x
5X+10(40-X)=360