1,2,3,4,5,题都要解

1 2 3 4 5 .1,2,3,4,5, (1)(1+2/3+3/4+4/5+5/6)*(1+3/4+4/5)-(1+3/4+4/5)*(2/3+3/4+4/5+ {3/4+4/5+5/6}+{1+2/3+3/4+4/5}-{1+2/3+3/4+4/5+5/6}×{2/3+3/4+4 1+2+3+4+5+5+1000 3,1,2,3,4,5题 1 2 3 4 5=1 3/5-（1/2-1/4)计算, 5/1*2*3+5/2*3*4+5/3*4*5+.+5/11*12*13 1/2+(1/3+2/3)+(1/4+2/4+3/4)+(1/5+2/5+3/5+4/5)+.+(1/60+2/60+3 1+2+3-4-5+1+1+2+3= 4^2÷(-1/4)-5^4÷(-5)^3,