1/3[-(5-1)/2]+5=1-(5-x)/5等于多少

5-1/5+5^2-1/5+5^3-1/5^3+…+5^n-1/5^n= 1=5 2=1 5 3=2 1 5 4=3 2 1 5 5=? 5 5 5 5=2 填符号5 5 5 5=3 5 5 5 5=4 5 5 5 5=1 计算(+5/2)-(-5/3)=-5/1(-5/2)-(-5/3)=5/12/1-3/1=6/1(-2/1)-3/1=-6/1 5 5 5 5 5=1 5 5 5 5 5=2 5 5 5 5 5=3 添上加减乘除或括号使等式成立 1 2 3 4 5=1 1()2()3()4()5=1 1+1-2+3-4+5=? 5x+1/3=2x+5+1/2 5x-1/2-2x-5/3=1 巧算：(1+1/2+1/3+1/4+1/5)*(1/2+1/3+1/4+1/5+1/6)-(1+1/2+1/3+1/4+1/5+1/6)*(1/2+1/3+1/4+1/5)(1+1/2+1/3+1/4+1/5)*(1/2+1/3+1/4+1/5+1/6)-(1+1/2+1/3+1/4+1/5+1/6)*(1/2+1/3+1/4+1/5)===== 1-3/5+1/2-2/5 1+2+3+4+5+(-5)+(+5)= 1/3[-(5-1)/2]+5=1-(5-x)/5等于多少 1+5=1 2+5=456 3+5=789 4+5=150 5+1=? 判断：1/4+2/5+3/5=1/4+（2/5+3/5）对错 1/3（1-2/5x)=5/6x 1+2+3-4-5+1+1+2+3=