| 脱式计算,能简算的要简算. 893+(594+107) 105+298 5×(17×24) 125×16 720÷16÷5 1000-293-707. |
| (1)893+(594+107) =(893+107)+594 =1000+594 =1594 (2)105+298 =(100+5)+(300-2) =(100+200)+(5-2) =400+3 =403 (3)5×(17×24) =(5×24)×17 =120×17 =(100+20)×17 =100×17+20×17 =1700+340 =2040 (4)125×16 =(125×8)×2 =1000×2 =2000 (5)720÷16÷5 =720÷(16×5) =720÷80 =9 (6)1000-293-707 =1000-(293+707) =1000-1000 =0 |
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a.12×(4+25)[ ]
a. 47+(14×5)(1)35+65=
65+35=
35+65○65+35