题目内容
用简便方法计算.(写出主要过程)
| 6.3+7.28+3.7= | 102×45= |
(1)6.3+7.28+3.7,
=7.28+(6.3+3.7),
=7.28+10,
=17.28;
(2)102×45,
=(100+2)×45,
=100×45+2×45,
=4500+90,
=4590.
=7.28+(6.3+3.7),
=7.28+10,
=17.28;
(2)102×45,
=(100+2)×45,
=100×45+2×45,
=4500+90,
=4590.
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