问题 解答题
口算.
240-200=______
360+50=______710-80=______
360÷4=______(31+40)×3=______630÷3=______
90÷9=______260-60=______230×3=______
(64-8)÷8=______73×2=______19×3=______
140×5=______80÷2=______(73-13)×7=______.
答案

240-200=40360+50=410710-80=630
360÷4=90(31+40)×3=213630÷3=210
90÷9=10260-60=200230×3=690
(64-8)÷8=773×2=14619×3=57
140×5=70080÷2=40(73-13)×7=420.
故答案为:40,410,630,90,213,210,10,200,690,7,146,57,700,40,420.

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