题目内容
计算下面各题 6.25-40÷16×2.5 | 10+24 | () |
[]. |
解:(1)6.25-40÷16×2.5
=6.25-40×2.5÷16,
=6.25-100÷16,
=6.25-6.25,
=0;
(2)10+24
=10+24×,
=10+9,
=19;
(3)()
=×2,
=;
(4)-×,
=-,
=;
(5)××
=××,
=1××,
=;
(6)[].
=[-]×,
=×,
=.
分析:算式(1)(5)可根据乘法交换律计算;
算式(2)(3)(4)(6)根据四则混合运算的运算顺序计算即可,先算乘除,再算加减,有括号的要先算括号里面的.
点评:完成有关于分数的四则混合运算时要细心,注意通分约分.
=6.25-40×2.5÷16,
=6.25-100÷16,
=6.25-6.25,
=0;
(2)10+24
=10+24×,
=10+9,
=19;
(3)()
=×2,
=;
(4)-×,
=-,
=;
(5)××
=××,
=1××,
=;
(6)[].
=[-]×,
=×,
=.
分析:算式(1)(5)可根据乘法交换律计算;
算式(2)(3)(4)(6)根据四则混合运算的运算顺序计算即可,先算乘除,再算加减,有括号的要先算括号里面的.
点评:完成有关于分数的四则混合运算时要细心,注意通分约分.
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