题目内容
用简便方法计算.
①9.98×78+22×9.98
②4.9+5.56+4.34+5
.
①9.98×78+22×9.98
②4.9+5.56+4.34+5
| 1 |
| 5 |
①9.98×78+22×9.98,
=9.98×(78+22),
=9.98×100,
=998;
②4.9+5.56+4.34+5
,
=(4.9+5.2)+(5.56+4.34),
=10.1+9.9,
=20.
=9.98×(78+22),
=9.98×100,
=998;
②4.9+5.56+4.34+5
| 1 |
| 5 |
=(4.9+5.2)+(5.56+4.34),
=10.1+9.9,
=20.
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