脱式计算  

（1）原式
=3/4x5/7x4/3-1/2
=3/4x4/3x5/7-1/2
=5/7-1/2
=3/14
（2）原式
=3.14x16-3.14x6
=3.14x(16-6)
=3.14x10
=31.4
（3）原式
=10-1/5+(35%-1/10)x1/5
=10-0.2+(0.35-0.1)x1/5
=10-0.2+0.25x1/5
=9.8+0.05
=9.85