1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550必须用解方程
问题描述:
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550
必须用解方程
答
=x(1+2+3+4+5+6+7+8+9+10+11+12+13+14+15)=120X=550.x=55/12
答
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550
120x=550
x=55/12=4.583