简算下面各题。
|
| (1)689+194 =689+200-6 =889-6 =883 |
(2)624﹣297 =624-300+3 =324+3 =327 |
(3)785﹣184﹣216 =785-(184+216) =785-400 =385 |
| (4)451﹣202 =451-200-2 =251-2 =249 |
(5)234+187+66 =(234+66)+187 =300+187 =487 |
(6)563﹣(263+154) =563-263-154 =300-154 =146 |
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a.12×(4+25)[ ]
a. 47+(14×5)(1)35+65=
65+35=
35+65○65+35