1-2+3-4+5-6...+99-100等于多少
您好:
1-2+3-4+5-6...+99-100
=(1-2)+(3-4)+(5-6)...+(99-100)
=-1-1-1……-1 (50个-1)
=-50
(1-2)+(3-4)+...(99-100)
=-1*50
=-50
1-2等于-1,又因为100除以2等于50,所以等于-50
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您好:
1-2+3-4+5-6...+99-100
=(1-2)+(3-4)+(5-6)...+(99-100)
=-1-1-1……-1 (50个-1)
=-50
(1-2)+(3-4)+...(99-100)
=-1*50
=-50
1-2等于-1,又因为100除以2等于50,所以等于-50