16.8-5.1-4.9能简便运算的要简便运算

问题描述:

16.8-5.1-4.9能简便运算的要简便运算
还有
14.2*99+14.2
(1/4+5/6-1/3)*12

16.8-5.1-4.9
=16.8-(5.1+4.9)
=16.8-10
=6.8
14.2*99+14.2
=14.2*(99+1)
=14.2*100=1420
(1/4+5/6-1/3)*12
=(1/4)*12+(5/6)*12-(1/3)*12
=3+10-4
=9