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=26.8
14.2*99+14.2=14.2*99+14.2*1=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

16.8-(5.1+4.9)
14.2(99+1)
(3/12+10/12-4/12)*12
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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