81x-342=76(x-2) 0.3x+7x-0.25x=21.15
(X+X)+(X-X)+(X*X)+(X/X)=100
x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?
0.3x-x*0.25=21.15-7x
0.3x+7x-0.25x+=21.15
0.3x-x乘以0.25=21.15-7x
0.3x+7x-0.25x=21.15
81x-342=76X(x-2)
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!)+.
(x+12)(x-2)+(x+7)(x+8)-(x+5)(x-10),其中x=2
2x+3x+4x+5x+x+6x+7x=100
x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x
x+(x+24)+(x+4)/2=7x