简便方法计算，4.7✘0.3+0.47✘4.2+0.047怎么计算
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4.7*0.3+0.47*4.2+0.047
=4.7*0.3+4.7*0.42+4.7*0.01
=4.7*(0.3+0.42+0.01)
=4.7*0.73
=(5-0.3)*0.73
=5*0.73-0.3*0.73
=3.65-0.219
=3.431
=4.7*0.3+4.7*0.42+4.7*0.01
=4.7*(0.3+0.42+0.01)
=4.7*0.73
=(5-0.3)*0.73
=5*0.73-0.3*0.73
=3.65-0.219
=3.431
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