题目内容
你能口算得又对又快吗?
(1)0.02×500=25×0.04=3.2×2-6.4=0.4×3+5.6=
(2)8.08÷8=5.4÷0.54=2.33÷23.3-0.01=15×0.2×0.2=
(3)5.61×100-100=26÷(1.7+0.9)=2.7×4+2.3×4=0.75÷3÷0.5=
(1)0.02×500=25×0.04=3.2×2-6.4=0.4×3+5.6=
(2)8.08÷8=5.4÷0.54=2.33÷23.3-0.01=15×0.2×0.2=
(3)5.61×100-100=26÷(1.7+0.9)=2.7×4+2.3×4=0.75÷3÷0.5=
分析:灵活运用凑十、凑百法进行计算,运用乘法分配律等运算定律可使问题简单化.
解答:解:(1)0.02×500=10,25×0.04=1,3.2×2-6.4=0,0.4×3+5.6=6.8;
(2)8.08÷8=1.01,5.4÷0.54=10,2.33÷23.3-0.01=0.09,15×0.2×0.2=0.6;
(3)5.61×100-100=461,26÷(1.7+0.9)=10,2.7×4+2.3×4=20,0.75÷3÷0.5=0.5.
(2)8.08÷8=1.01,5.4÷0.54=10,2.33÷23.3-0.01=0.09,15×0.2×0.2=0.6;
(3)5.61×100-100=461,26÷(1.7+0.9)=10,2.7×4+2.3×4=20,0.75÷3÷0.5=0.5.
点评:此题计算中注意小数位的移动及乘法分配律的灵活运用.
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