x.45+x.55=1000. Tìm x
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x x 45 + x x 55 = 1000
x x (45 + 55) = 1000
x x 100 = 1000
x = 1000 : 100
x = 10
![](https://rs.olm.vn/images/avt/0.png?1311)
a. x x 45 + x x 55 = 1000
x x (45 + 55) = 1000
x x 100 = 1000
x = 1000 : 100
x = 10
b.
6 x + 1 2 = 2 6 : x + 1 2 = 2 6 : x = 2 - 1 2 6 : x = 3 2 x = 6 : 3 2 x = 4
![](https://rs.olm.vn/images/avt/0.png?1311)
x . 45 + x . 55 = 1000
x . ( 45 + 55 ) = 1000
x . 100 = 1000
x = 1000 : 100
x = 10
Vậy x = 10
6 / x + 1 / 2 = 2
6 / x = 2 - 1 / 2
6 / x = 3 / 2
6 / x = 6 / 4
=> x = 4
Vậy x = 4
![](https://rs.olm.vn/images/avt/0.png?1311)
a, X x 45 + X x 55 = 1000
X x (45 + 55) = 1000
X x 100 = 1000
X = 1000 : 100
X = 10
b, \(\frac{6}{x}+\frac{1}{2}=2\)
\(\frac{6}{x}=2-\frac{1}{2}\)
\(\frac{6}{x}=\frac{3}{2}\)
\(\frac{6}{x}=\frac{6}{4}\)
\(x=4\)
a ) \(x\times45+x\times55=1000\)
\(x\times\left(45+55\right)=1000\)
\(x\times100=1000\)
\(x=1000\div100=10\)
b ) \(\frac{6}{x}+\frac{1}{2}=2\)
\(\frac{6}{x}=2-\frac{1}{2}\)
\(\frac{6}{x}=\frac{3}{2}\)
\(=>x=6\div3\times2=4\)
![](https://rs.olm.vn/images/avt/0.png?1311)
( ) x 9999 x 9999 x 9999 x ... ( có 1000 số 9999 ) x 38 x 45 x 36 x 25 x 58 x 69 x 245 x 246 x 213 x 222 x 546 x 8312 x 999 x 454 x 9999 x 789 x 2563 x 0 x 25 x 24 x 23 x 26 258 x 256 256 x 256 x 24531 x 55 x ( 45 x 1 + 45 x 2 + 45 x 3 + ... + 45 x 1000 + 45 x 1001 + ... + 45 x 9999 ) = 0 nhé
/HT\
( ) x 9999 x 9999 x 9999 x ... ( có 1000 số 9999 ) x 38 x 45 x 36 x 25 x 58 x 69 x 245 x 246 x 213 x 222 x 546 x 8312 x 999 x 454 x 9999 x 789 x 2563 x 0 x 25 x 24 x 23 x 26 258 x 256 256 x 256 x 24531 x 55 x ( 45 x 1 + 45 x 2 + 45 x 3 + ... + 45 x 1000 + 45 x 1001 + ... + 45 x 9999 ) = 0
HT
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a) \(\frac{399\cdot45+55\cdot399}{1995\cdot1996-1991\cdot1995}\)
\(=\frac{399\cdot\left(45+55\right)}{1995\cdot\left(1996-1991\right)}\)
\(=\frac{399\cdot100}{1995\cdot5}\)
\(=4\)
=))
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(\frac{399\cdot45+55\cdot399}{1995\cdot1996-1991\cdot1995}\)
\(=\frac{399\cdot\left(45+55\right)}{1995\cdot\left(1996-1991\right)}\)
\(=\frac{399\cdot100}{1995\cdot5}\)
\(=4\)
=))
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 399 x 45 + 55 x 399
= 399 x (45 + 55)
= 399 x 100
= 39900
1995 x 1996 - 996
= 3982020 - 996
= 3981024
b) 1996 x 1995 - 996
= 3982020 - 996
= 3981024
1000 + 1996 x 1994
= 1000 + 3980024
= 3981024
c) 637 x 527 - 189
= 335699 - 189
= 335510
526 x 637 + 448
= 335062 + 448
= 335510
Lần sau dùng máy tính mà tính nhá !!!
a) 399 x 45 + 55 x 399 = 399 x (45 + 55) = 399 x 100 = 39900 1995 x 1996 - 996 = 3982020 - 996 = 3981024 b) 1996 x 1995 - 996 = 3982020 - 996 = 3981024 1000 + 1996 x 1994 = 1000 + 3980024 = 3981024 c) 637 x 527 - 189 = 335699 - 189 = 335510 526 x 637 + 448 = 335062 + 448 = 335510
x.(45 + 55) = 1000
x. 100 =1000
x = 1000 : 100
x =10
X.45+X.55=1000
X.(45+55)=1000
X=1000:100
X=10