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6.8×2.01=6.8×2+6.8×0.01可以用________进行简算.

乘法分配律
分析:计算6.8×2.01时,先把2.01分解成(2+0.01),再运用乘法分配律简算.
解答:6.8×2.01,
=6.8×(2+0.01),
=6.8×2+6.8×0.01;
这是运用乘法分配律简算.
点评:乘法分配律是最常用的简便运算的方法,要熟练掌握,灵活运用.
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8.4×0.2+1.6×0.2=8.4÷4.2=0.05×0.8=
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19.6÷2=8.8÷2.2=3.9+2.03=
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12÷0.3=2.87÷0.7=13÷4=
24÷4+56÷4=2.1×0.3÷2.1=2.3-0÷8.1=
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