7.8+2.4X＝6.8 X-0.6X-9＝25 1/4÷2

7.8+2.4X＝6.8 X-0.6X-9＝25 1/4÷2 x*x+2x+x*x+10x+x*x+25+2x+x*x+1+1+16+x*x+4x*x+9-12x+16x*x+4-1 方程x+1x+2+x+8x+9＝x+2x+3+x+7x+8 解方程：x（2X-3）+2x（x-1）＝4x（x-2）+9 |X-1|+|X-2|+|X-3|+|X-4|+|X-5|+|X-6|+|X-7|+|X-8|+|X-9|+|X-10| x^2-x/x+1÷x/x+1 ；x^2+6x+9/x^2-9÷x+2/x-3；2/a÷4/a x(2-1/x)+x/(x^2-2x)÷(3-x)/(x^2-4) (x+1-1/1-x)÷(x-x²/x-1) (x-4/x-x-6+ x+2/x-3)÷x+1/x-3 5.9x-2.4x＝9 6.8x＝27.2 解方程6^x＋4^x＝9^x,9^（-x）-2*3^（1-x）=27 x/(x-1) -1＝3/(x-1)(x+2) y=(x-1)(x-2)(x-3)(x-4)(x-5)(x-6)(x-7)(x-8)(x-9)(x-10)的导数在x=1