题目内容

计算下面各题,能简算的要简算
0.87×4.5-4.5×0.673.18-(0.33+1.18)
1.2+1.47÷0.71.76-[(0.74+0.26)÷0.8].

解:(1)0.87×4.5-4.5×0.67,
=4.5×(0.87-0.67),
=4.5×0.2,
=0.9;

(2)3.18-(0.33+1.18),
=3.18-1.18-0.33,
=2-0.33,
=1.67;

(3)1.2+1.47÷0.7,
=1.2+2.1,
=3.3;

(4)1.76-[(0.74+0.26)÷0.8],
=1.76-[1÷0.8],
=1.76-1.25,
=0.51;
分析:(1)利用乘法分配律进行简便计算即可;
(2)先去掉括号,计算3.18-1.18,再计算2-0.33,即可得解;
(3)先算除法,再算加法;
(4)依据小数四则混合运算的顺序,先算小括号里的,再算中括号里的,最后算括号外面的减法,据此解答即可.
点评:此题主要考查小数四则混合运算的顺序,要注意能简算的要简算.
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