5x-12

12^x+5^x 3x·x-5x-122x·x·x-x·x-4x+3x·x·x-6x-5x·x+6x+64x·x+12x+7 (x+12)(x-2)+(x+7)(x+8)-(x+5)(x-10),其中x=2 通分:x+4/x^2-8x+15,x-5/x^2+x-12,x-3/x^2-x-20 因式分解(x+1)(x+3)(x+5)(x+7)-12 x^2-6x+5/-x^2+4x+12 (x^5-12x^3+36x)/(x^2-6) 3x-{-4x+{5x-(12x-10]+2} 计算：x^2-5x+6/x^2-x-2x^2-7x+12/x^2-2x-8 计算：x^2-5x+6/x^2-x-2x^2-7x+12/x^2-2x-8 1+x+x^2+x^3+x^4+x^5+x^6+x^7+x^8+x^9+x^10+x^11+x^12=97.8x+x^2+x^3+x^4+x^5+x^6+x^7+x^8+x^9+x^10+x^11+x^12=97.8 好多年没有用过过数学公式了 想不起来怎么算了 想知道 X值是多少 (x*x+5x+2)(x*x+5x+3)-12 (4/x-5)+(x-3)/(12-x)=(x-45)/(x^2-17x+60) 25x X 5 +15x X 10 +12x X 15 =7280 4(x+5)(x+6)(x+10)(x+12)-3x*x 1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550必须用解方程 数学化简3x-x^2/5x+4 x 18/4x-12(3x-x^2)/(5x+4) x 18/(4x-12) 2x-6/x^2-4x+4除以12-4x/x^2+5X-6除以x^2+5x+6/x^2-5x-6 .X²+13X+36 .X²+5X-20 .X²-2X-15 .8（X²+X）²-8（X²+X）+12