2·5×7·8+7·4×7·8+0·78的简便运算
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2·5×7·8+7·4×7·8+0·78的简便运算
2·5×7·8+7·4×7·8+0·78的简便运算
2·5×7·8+7·4×7·8+0·78的简便运算
(2.5+7.4+0.1)×7.8=78
2·5×7·8+7·4×7·8+0·78的简便运算
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