数学题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
要用简便方法的:211x555+445x789+555x789+211x445
![数学题211x555+445x789+555x789+211x445](/uploads/image/z/8864784-0-4.jpg?t=%E6%95%B0%E5%AD%A6%E9%A2%98211x555%2B445x789%2B555x789%2B211x445)
211x555+445x789+555x789+211x445
=(211+789)*555+(789+211)*455
=1000*555+1000*455
=1000*(555+455)
=1000*1000
=1000000
=(211+789)*555+(789+211)*455
=1000*555+1000*455
=1000*(555+455)
=1000*1000
=1000000