数学题211x555+445x789+555x789+211x445要用简便方法的：211x555+445x789+555x789+211x445
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数学题211x555+445x789+555x789+211x445要用简便方法的：211x555+445x789+555x789+211x445数学题211x555+445x789+555x789+
数学题211x555+445x789+555x789+211x445要用简便方法的：211x555+445x789+555x789+211x445
数学题211x555+445x789+555x789+211x445
要用简便方法的：211x555+445x789+555x789+211x445
数学题211x555+445x789+555x789+211x445要用简便方法的：211x555+445x789+555x789+211x445
211x555+445x789+555x789+211x445
=(211+789)*555+(789+211)*455
=1000*555+1000*455
=1000*(555+455)
=1000*1000
=1000000