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a, Ta có:
5X + 4.5 = 4.5
=> X = 0
b,
a + a + ... + a = 99
=> 99a = 99
=> a = 1
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abc:(a+b+c)=100
aba=(a+b+c)x100
abc=a x100+bx100+cx100
ax100+bx10+c=ax100+bx100+cx100
( đề có vẻ sai )
abc:(a+b+c)=100
aba=(a+b+c)x100
abc=a x100+bx100+cx100
ax100+bx10+c=ax100+bx100+cx100
( đề có vẻ sai ) Nếu bn cảm thấy đúng thì k cho mình nhé!Học Tốt
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a x ( 1 + 2 + 3 + ..+50) = 127500
a x [ ( 50 + 1 ) x 50 : 2 ]= 127500
a x 1275 = 127500
a = 127500 : 1275
a = 100
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link tham khảo
https://olm.vn/hoi-dap/detail/9212510579.html
hok tốt
\(\left(a+1\right)\times\left(a+2\right)\times\left(a+3\right)-a\times\left(a+1\right)\times\left(a+2\right)\)
\(=\left(a+3\right)\times\left[\left(a+1\right)\times\left(a+2\right)\right]-a\left[\left(a+1\right)\times\left(a+2\right)\right]\)
\(=\left[\left(a+3\right)-a\right]\times\left[\left(a+1\right)\times\left(a+2\right)\right]\)
\(=\left[3+\left(a-a\right)\right]\times\left[\left(a+1\right)\times\left(a+2\right)\right]\)
\(=3\times\left[\left(a+1\right)\times\left(a+2\right)\right]\)
\(=\left[3\times\left(a+2\right)\right]\times\left(a+1\right)\)
\(=\left(3\times a+3\times2\right)\times\left(a+1\right)\)
\(=\left(3\times a+6\right)\times\left(a+1\right)\)
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a x 3 + a x 7 + a x 6 + a x 4 = 2000 : 100
a x 20 = 20
a = 20 / 20
a = 1
a x3 +a x7 +a x6 +a x 4=2000:100
a x (3+7+6+4)=20
a x 20 =20
a=20:20
a=1
thế 1 chử A=1 thì ta có: A . A . A = 11 . 11 . 11 . Vậy A=11
1331=11x11x11 suy ra A=11