计算下面各题. 0.8÷2.5÷410.89-1.89÷0.541.08×2.4÷2.7    2.05÷8.2+3.64.5÷1.25×84.8×0.27+0.52×2.7.

问题描述:

计算下面各题.

0.8÷2.5÷4 10.89-1.89÷0.54 1.08×2.4÷2.7    
2.05÷8.2+3.6 4.5÷1.25×8 4.8×0.27+0.52×2.7.

(1)0.8÷2.5÷4
=0.8÷(2.5×4)
=0.8÷10
=0.08;
(2)10.89-1.89÷0.54
=10.89-3.5
=7.39;
(3)1.08×2.4÷2.7
=2.592÷2.7
=0.96;
(4)2.05÷8.2+3.6
=0.25+3.6
=3.85;
(5)4.5÷1.25×8
=3.6×8
=28.8;
(6)4.8×0.27+0.52×2.7
=0.48×2.7+0.52×2.7
=(0.48+0.52)×2.7
=1×2.7
=2.7.
答案解析:(1)运用除法的性质简算;
(2)先算除法,再算减法;
(3)从左到右依次计算;
(4)先算除法,再算加法;
(5)先算除法,再算乘法;
(6)把4.8×0.27化为0.48×2.7,再利用乘法分配律简算.
考试点:小数四则混合运算.


知识点:此题是考查小数的四则混合运算,要仔细观察算式的特点,灵活运用一些定律进行简便计算.