Toán Lớp 6: Tìm số nguyên x, biết:
a) (x+1)+(x+2)+(x+3)+…+(x+100)=7050
b) x+1+3+5+…+97+99=2+4+6+8+…+98+100
c) (x+1)+(x−2)+(x−3)+(x+4)+(x+5)+…+(x+2001)+(x−2002)+(x−2003)+(x+2004)=0
d) (x+1)−(x−2)+(x+3)−(x−4)+…+(x+11)−(x−12)=x+13.
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Toán Lớp 6: Tìm số nguyên x, biết:
a) (x+1)+(x+2)+(x+3)+…+(x+100)=7050
b) x+1+3+5+…+97+99=2+4+6+8+…+98+100
c) (x+1)+(x−2)+(x−3)+(x+4)+(x+5)+…+(x+2001)+(x−2002)+(x−2003)+(x+2004)=0
d) (x+1)−(x−2)+(x+3)−(x−4)+…+(x+11)−(x−12)=x+13.
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