Toán Lớp 6: Tìm x
1+35+…+x=3200 [x là số lẻ)
(x+1)+(x+2)+(x+3)+…+(x+100)=5750
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Toán Lớp 6: Tìm x
1+35+…+x=3200 [x là số lẻ)
(x+1)+(x+2)+(x+3)+…+(x+100)=5750
Comments ( 1 )
=> 100x + (1 + 2 + 3 + … + 100) = 5750
=> 100x + 5050 = 5750
=> 100x = 5750 – 5050
=> 100x = 700
=> x = 700 : 100
=> x = 7