计算:211×555+445×789+555×789+211×445=______.
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计算:211×555+445×789+555×789+211×445=______.
原式=(211×555+211×445)+(445×789+555×789)
=211×(555+445)+789×(445+555)
=211×1000+789×1000
=1000×(211+789)
=106.
故答案为106.
=211×(555+445)+789×(445+555)
=211×1000+789×1000
=1000×(211+789)
=106.
故答案为106.
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计算:57.32°=______度______分______秒.
1.计算:(1)211×555+445×789+555×789+211×445 (2)S=1-2+3-4+...+(-1