脱式计算,能简算的要简算.0.125×4.78×80 (0.4+40)×2.5 &nb...

2025-04-22 20:47:23
推荐回答(1个)
回答1:

(1)0.125×4.78×80    
=0.125×80×4.78
=10×4.78
=47.8;
   
(2)(0.4+40)×2.5        
=0.4×2.5+40×2.5
=1+100
=101;
  
(3)6.9×87+6.9×14-6.9
=6.9×(87+14-1)
=6.9×100
=690.