(2 1/2 * 31/3 * 41/4/10-1/5*53/5) / ( 34/3 * 5-7/5 / 4-3/5 * 6)
The value of 21/2.31/3.41/410−1/5.53/5÷34/3.5−7/54−3/5.6 is