题目内容
用简便方法计算(要写出简算过程)
①475-198
②0.7+3.9+4.3+6.1
③(
+
)×15.
①475-198
②0.7+3.9+4.3+6.1
③(
| 1 |
| 3 |
| 2 |
| 5 |
①475-198,
=475-(200-2),
=475-200+2,
=275+2,
=277;
②0.7+3.9+4.3+6.1,
=(0.7+4.3)+(3.9+6.1),
=5+10,
=15;
③(
+
)×15,
=
×15+
×15,
=5+6,
=11.
=475-(200-2),
=475-200+2,
=275+2,
=277;
②0.7+3.9+4.3+6.1,
=(0.7+4.3)+(3.9+6.1),
=5+10,
=15;
③(
| 1 |
| 3 |
| 2 |
| 5 |
=
| 1 |
| 3 |
| 2 |
| 5 |
=5+6,
=11.
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