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