Toán Lớp 6: x+1-2+3-4+5-6+……….+99-98+99-100=2000
(x-1)+(x-2)+(x-3)+(x-4)+………..+(x-99)+(x-100)=5950
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Toán Lớp 6: x+1-2+3-4+5-6+……….+99-98+99-100=2000
(x-1)+(x-2)+(x-3)+(x-4)+………..+(x-99)+(x-100)=5950
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