Toán Lớp 6: ( x + 1 ) + ( x + 2 ) + ….. + ( x + 30 ) = 795
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Toán Lớp 6: ( x + 1 ) + ( x + 2 ) + ….. + ( x + 30 ) = 795
Comments ( 2 )
(x + 1) + (x + 2) + ……. + (x + 30) = 795
=> (x + x + …. +x) + (1 + 2 + …. + 30) = 795
=> SSH của x là: (30 – 1) : 1 + 1 = 30 (số)
=> 30x + 465 = 795
=> 30x = 795 – 465
=> 30x = 330
=> x = 330 : 30
=> x = 11
Vậy x = 11
( x + 1 ) + ( x + 2 ) + … + ( x + 30) = 795
=> ( x + x + … + x ) + ( 1 + 2 + … + 30) = 795
Có số số x là :
( 30 – 1) : 1 + 1 = 30 ( số )
Ta có :
30x + 465 = 795
=> 30x = 795 – 465
=> 30x = 330
=> x = 330 : 30
=> x = 11
Vậy x = 11
#dtkc