根据给出的规律,计算下面的算 规律: = 1 - = - = - … 题目: + + + + + =( 1 - ) + ( - )+ ( - )+ ( - )+ ( - )+ ( - ) = 1 - + - + - + - + - + - = 1 - = 规律公式: - = 例:1+ 2 + 3 + 4 + 5 =1+( 2+ ) + (3+ ) + (4+ ) + (5+ ) =1+ 2+ + 3+ + 4+ + 5+ =( 1+2+3+4+5)+( + + + ) =21+( - + - + - + - ) =21+( - ) =21+( - ) =21+ =21
