3(x+5)-42=12
2(x+5)^2-(x+6)^2-(x+2)(x-2)=42 (2x+1)(x-3)-(2x+3)(x-1)大于等于12
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550
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!)+.
7x-14=5x+9 3x-12=5x-20 56x=42(x+2)用方程解答(五年级的)
5x+9x=6x*2+12 x+9-x/3=4
x^3×x^5×x+(x^3)^12+4(x^6)^2=?
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+12=(5x+12)X 7分之3
(5X-15)-(2X+3)=X+12
3x-(x+5)=12