Question

Tìm số nguyên x biết:

( x + 1 ) + ( x +3 ) + ( x +5 ) +...+ (x+99) = 0

Answer 1

=> x.[(99-1):1+1]+[(1+99).99:2]=0

=> x.99+100.99:2=0

=> x.99+4950=0

=> x.9=0-4950

=> x.9=-4950

=> x= (-4950):9

=> x=-550

Answer 2

(x+x+x+....+x)+(1+2+3+.....+99)=0

x.99+[(99-1):1+1]=0

x.99+[99.(99+1):2]=0

x.99+4950=0

x.99         =0-4950=-4950

=>x         =-4950:99=-50

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