3 4 5 6 7 8

3,4,5,6,7,8题 3'4'5'6'7'8'9 2,3,4,5,6,7,8, 3,4,5,6,7,8, 2 3 4 5 6 7 8 3/8 5/3 7/6 6/4 12.4/11 3/5×4/6×5/7×6/8+5/6×6/7=? 5*6*7*8分之5*6*7*8-2*3*4*5 简算 1*2*3*4*5+5*6*7*8*9/5*6*7*8*9 5×6×7×8×9分之5×6×7×8×9-1×2×3×4×5 1/(2/3)/(3/4)/(4/5)/(5/6)/(6/7)/(7/8) 用简算 1/【2/3】/【3/4】/【4/5】/【5/6】/【6/7】/【7/8】