31200 x 20154 / 3640 =
x*3+x*5+x*7 + ....+x*101 =31200
x*3 + x*5 + x*7 + ... + x*101 = 31200
=> x*(3 + 5 + 7 + ... + 101) = 31200
=> x*(101 + 3)*[(101 - 3) : 2 + 1] : 2 = 31200
=> x*2600 = 31200
=> x = 31200 : 2600
=> x = 12
X x3;X x5;X x7;...X x101=31200
75883-{31200+x}=999
tìm x
75883 - (31200+x) = 999
=> 31200+x = 74884
=> x = 74884 - 31200
=> x = 43684
X * 3 + X * 5+X*7 + ...X * 101 = 31200
x*(3+5+7+....+101)=31200
suy ra x*2600=31200
suy ra x=12
tim x biết : x*3+x*5+x*7+......+x*101=31200
tìm x biết x*3+x*5+x*7.......+x*101=31200
Xx3+Xx5+Xx7+.................+Xx101=31200
X=
Xx3+Xx5+Xx7+.......+Xx101= 31200
Xx(3+5+7+.....+101)= 31200
Xx 2600= 31200
X= 12
Tìm x biết x x 3 + x x 5 + x x 7 +......+ x x 100 = 31200
X x 3+X x 5 + X x 7+....+X x101=31200. Tìm X
X x 3 + X x 5 X x 7 ... + X x 101 = 31200
= X x ( 3+5+7 ... + 101)=31200
3+5+7...+101 = 2600
X = 31200 : 2600 = 12
X = 12
xin cam on
nho like nhe vi minh da mat cong ghi bai ra
Lấy X làm thừa số chung
X x ( 3 + 5 + 7 + ... + 101) = 31200
3 + 5 + 7 + ... + 101 = 2600
=> X = 31200 - 2600
=> X = 28600