1；3；4

1/4,-3/4,-3/4,1/4,17/4,( ) 1/3,2/3,1/3,1/4,2/4,3/4,2/4,1/4,( ),( ),( ),( ),( ),( ),( ) “1”“2”“3”“4” 1-4-3是什么意思 1+2+3×4 1/4+3/4×2/3 3 1/4 1/5 4/7 (1+1/2+1/3+1/4+1/5)*(1/3+1/4+1)-(1+1/3+1/4)*(1/2+1/3+1/4+1/5 2(3+1)(3^2+1)(3^3+1)(3^4+1)(3^8+1)+1 3/1,1.5,1,3/4,0.6,(),(),(),... 2+1+4 3+3+1 (（1^4+1/4)(3^4+1/4)(5^4+1/4).(19^4+1/4))/((2^4+1/4)(4^4+1/4)