题目内容

计算.(怎样简便怎样算).
5.64-2.4÷0.48 12.8+10.8÷45 13.2÷8÷1.25
(70.8-67.55)÷0.25 1.63+4.19+2.37 2.16×5.6+4.4×2.16.
分析:(1)先算除法,再算减法;
(2)先算除法,再算加法;
(3)13.2连续除以8与1.25,等于除以8与1.25的乘积;
(4)先算减法,再算除法;
(5)根据加法交换律进行简算;
(6)根据乘法分配律进行简算.
解答:解:
(1)5.64-2.4÷0.48,
=5.64-5,
=0.64;

(2)12.8+10.8÷45,
=12.8+0.24,
=13.04;

(3)13.2÷8÷1.25,
=13.2÷(8×1.25),
=13.2÷10,
=1.32;

(4)(70.8-67.55)÷0.25,
=3.25÷0.25,
=13;

(5)1.63+4.19+2.37,
=1.63+2.37++4.19,
=4+4.19,
=8.19;

(6)2.16×5.6+4.4×2.16,
=2.16×(5.6+4.4),
=2.16×10,
=21.6.
点评:根据题意,先弄清运算顺序,然后再进行计算,能简算的要简算.
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