| 脱式计算(能简算的要简算) 17.64÷4.9+6.73 3.4÷[(1.2+0.5)×5] 9.9+19.9+999.9+0.3 0.25×12.5×32. |
| ①17.64÷4.9+6.73 =3.6+6.73 =10.33 ②3.4÷[(1.2+0.5)×5] =3.4÷(6+2.5) =3.4÷8.5 =0.4 ③9.9+19.9+999.9+0.3 =(9.9+0.1)+(19.9+0.1)+(999.9+0.1) =10+20+1000 =1030 ④0.25×12.5×32 =(0.25×4)×(12.5×8) =1×100 =100 |
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