| 用简便方法计算 950÷50= 430÷20= 870÷80= |
| ①950÷50 =950÷(10×5) =950÷10÷5 =95÷5 =19 ②430÷20 =430÷(10×2) =430÷10÷2 =43÷2 =21.5 ③870÷80 =870÷(10×8) =870÷10÷8 =87÷8 =10
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a.12×(4+25)[ ]
a. 47+(14×5)(1)35+65=
65+35=
35+65○65+35