题目内容
计算:
(1)20×30÷60×10=______.
(2)999×78+333×666=______.
(3)2006-2005+2004-2003+…+4-3+2-1=______.
(1)20×30÷60×10=______.
(2)999×78+333×666=______.
(3)2006-2005+2004-2003+…+4-3+2-1=______.
(1)20×30÷60×10,
=600÷60×10,
=10×10,
=100;
(2)999×78+333×666,
=999×78+999×222,
=999×(78+222),
=999×300,
=299700;
(3)2006-2005+2004-2003+…+4-3+2-1,
=(2006-2005)+(2004-2003)+…+(4-3)+(2-1),
=1+1…+1+1,(一共1003个1),
=1×1003,
=1003.
故答案为:100,299700,1003.
=600÷60×10,
=10×10,
=100;
(2)999×78+333×666,
=999×78+999×222,
=999×(78+222),
=999×300,
=299700;
(3)2006-2005+2004-2003+…+4-3+2-1,
=(2006-2005)+(2004-2003)+…+(4-3)+(2-1),
=1+1…+1+1,(一共1003个1),
=1×1003,
=1003.
故答案为:100,299700,1003.
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