题目内容
口算
(1)2×1＋0.4＝ (2)4200÷60＝
(3)10.4万＋0.2万＝ (4)850－170＝
(5)400×6＝ (6)490＋140＝
答案：2.4;70;10.6万;680;2400;630
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