题目内容
【题目】计算各题,能简算的要简算.
13.6+4.5×2.2 3.24×0.4×2.5
15.2×101﹣15.2 6.4÷0.4÷2.
【答案】①13.6+4.5×2.2
=13.6+9.9
=23.5;
②3.24×0.4×2.5
=3.24×(0.4×2.5)
=3.24×1
=3.24;
③15.2×101﹣15.2
=15.2×(101﹣1)
=152;
④6.4÷0.4÷2
=16÷2
=8.
【解析】
试题分析:(1)先算乘法,再算加法;
(2)先运用乘法结合律计算0.4×2.5,然后再和3.24相乘即可;
(3)运用乘法分配律进行简算;
(4)根据同级运算,按照从左向右的顺序进行解答即可.
解:①13.6+4.5×2.2
=13.6+9.9
=23.5;
②3.24×0.4×2.5
=3.24×(0.4×2.5)
=3.24×1
=3.24;
③15.2×101﹣15.2
=15.2×(101﹣1)
=152;
④6.4÷0.4÷2
=16÷2
=8.
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