①5(x-5)=37.5 ②7.5x+30=2.5x+100 ③11(x-3)/0.4=5.5
①5(x-5)=37.5 ②7.5x+30=2.5x+100 ③11(x-3)/0.4=5.5
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!)+.
2x+3x+4x+5x+x+6x+7x=100
x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x
(X+X)+(X-X)+(X*X)+(X/X)=100
因式分解法计算:①(x+2)²=(5-2x)² ②2x(x+2)=3x+6 ③x²-x=x
(2x-1)/(x-1)(x-2)=(x-5)/(x-2)(x-3) x/2x^2-11x-21=(x+7)/x^2-1
1x+2x+3x+4x+5x+6x+7x…+99x=100
解方程:2x+4x+6x...+100x=1-(x+3x+5x+...+99x)
x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?
用公式法解① x(2x-5)=4x-10②x²+5x+7=3x+11③1-8x+16x²=2-8x
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550