1 .Tìm y :
y . 45 + y . 55 = 1000
bài 5; Tìm y
a)\(980+y:94=8245\)
b)\(45\) x y x \(36=3240\)
c) \(3865-y+875=1000\)
d)\(4788:126\) x y \(=1596\)
e) \(24624\) : y : 9\(=76\)
a) \(980+y:94=8245\)
\(y:94=7265\)
\(y=7265\times94\)
\(y=682910\)
b) \(45\times y\times36=3240\)
\(45\times y=3240:36\)
\(45\times y=90\)
\(y=90:45\)
\(y=2\)
c) \(3865-y+875=1000\)
\(3865-y=125\)
\(y=3865-125\)
\(y=3740\)
d) \(4788:126\times y=1596\)
\(126\times y=4788:1596\)
\(126\times y=3\)
\(y=\dfrac{3}{126}\)
\(y=\dfrac{1}{42}\)
e) \(24624:y:9=76\)
\(y:9=24624:76\)
\(y:9=324\)
\(y=324\times9\)
\(y=2916\)
1) tìm y thuộc tập hợp N
a) 84 - 4 . ( 2y + 1 ) = 45
b) 15.y - 200y = 1201
c) ( ( y + 32 ) - 15 ) : 2 = 60
d) ( ( y.y + 55 ) - 31 ) .14 = 560
Tìm x :
a) x . 45 + x . 55 = 1000
y x 45 + y x 55 = 12300
y x 45 + y x 55 = 12300
y(45+55)=12300
y.100=12300
y=123
y x 45 + y x 55 = 12300
y x ( 45 + 55 ) = 12300
y x 100 = 12300
y = 12300 : 100
y = 123
Tìm x: x x 45 + x x 55 = 1000
x x 45 + x x 55 = 1000
x x (45 + 55) = 1000
x x 100 = 1000
x = 1000 : 100
x = 10
x.45+x.55=1000. Tìm x
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
Tìm x
X × 45 + x × 55 = 1000
6/x + 1/2 = 2
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
x . 45 + x . 55 = 1000
x . ( 45 + 55 ) = 1000
x . 100 = 1000
x = 1000 : 100
x = 10
..............................................
Cho 13 + x = 91, y - 45 = 55. x + y = ?
13+x=91
x=91-13
x=78
y-45=55
y=55+45
y=100
x+y=78+100=178
Tìm x :
a. x x 45 + x x 55 = 1000
b. 6 x + 1 2 = 2
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