题目内容
脱式计算.
412÷4×3
225÷5÷3
638-320÷8.
412÷4×3
225÷5÷3
638-320÷8.
(1)412÷4×3
=103×3
=309;
(2)225÷5÷3
=45÷3
=15;
(3)638-320÷8
=638-40
=598.
=103×3
=309;
(2)225÷5÷3
=45÷3
=15;
(3)638-320÷8
=638-40
=598.
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