168.1÷(4.3×2-0.4) 168.8÷(24.3×2-6.4)
(13×0.58-4.87+0.42×13- 5.13) ×4.25
999×778+333×666
-(+)
0.5×1.6+0.5×26.4
×(+0.8÷)