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](/uploads/image/z/3851581-13-1.jpg?t=%E6%95%B0%E5%AD%A6%E9%A2%98211x555%2B445x789%2B555x789%2B211x445%E8%A6%81%E7%94%A8%E7%AE%80%E4%BE%BF%E6%96%B9%E6%B3%95%E7%9A%84%EF%BC%9A211x555%2B445x789%2B555x789%2B211x445)
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