Question

用简便方法计算3/4-(1/2-1/4) 7/16+9/20-5/16+11/20

Answer 1

3/4-(1/2-1/4)
=3/4+1/4-1/2
=1-1/2
=1/2
7/16+9/20-5/16+11/20
=(7/16-5/16)+(9/20+11/20)
=1/8+1
=1又1/8