题目内容
口算
0.2×0.2÷0.1=
0.3×5÷0.15=
2.5×4÷0.5=
0.28+4.52=
25×3.6×4=
0.45÷0.9×2=
0.2×0.2÷0.1=
0.3×5÷0.15=
2.5×4÷0.5=
0.28+4.52=
25×3.6×4=
0.45÷0.9×2=
分析:①先算0.2×0.2=0.04,再算0.04÷0.1=0.4;②先算0.3×5=0.15,再算0.15÷0.15;③先算2.5×4=10,再算10÷0.5;④注意小数点对齐;⑤运用乘法交换律与结合律简算;⑥先算0.45÷0.9=0.5,再算0.5×2即可.
解答:解:0.2×0.2÷0.1=0.4;
0.3×5÷0.15=1;
2.5×4÷0.5=20;
0.28+4.52=4.8;
25×3.6×4=360;
0.45÷0.9×2=1.
0.3×5÷0.15=1;
2.5×4÷0.5=20;
0.28+4.52=4.8;
25×3.6×4=360;
0.45÷0.9×2=1.
点评:此题考查了小数的四则混合运算,根据题目特点,采取不同的方法,进行计算.

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