题目内容
用递等式计算. ①576÷3÷4 |
②17×34-278 |
③85×(28+32) | ④(601-246)÷5. |
分析:按四则运算的顺序和法则进行计算.576÷3÷4看做576÷(3×4)计算简便.
解答:解:①576÷3÷4,
=576÷(3×4),
=576÷12,
=48;
②17×34-278,
=578-278,
=300;
③85×(28+32),
=85×60,
=5100;
④(601-246)÷5,
=355÷5,
=71.
=576÷(3×4),
=576÷12,
=48;
②17×34-278,
=578-278,
=300;
③85×(28+32),
=85×60,
=5100;
④(601-246)÷5,
=355÷5,
=71.
点评:此题考查四则运算的顺序,能用简便方法的用简便方法计算.
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