a) X x 48 + 52 x X =160
X x ( 48+52) = 160
X x 100 = 160
X = 8/5
b) 7 x ( 8+2xX) =210
8+2xX = 30
2xX= 22
X= 11
c) X x 56 + 44 x X+285 x X =130
X x ( 56+44+285)= 130
X x 385 =130
X = 26/77
d) (x-12) x 17 : 11= 51
( x-12) x17 =561
x-12 = 33
x= 45
e) 915 x X +285 x X =48
X x( 915+285) = 48
X x 1200 = 48
X =1/25
\(48x+52x=160\)
\(x.\left(48+52\right)=160\)
\(100x=160\)
\(x=\frac{160}{100}\)
\(x=1,6\)
Vậy \(x=1,6\)
Đăng ít thôi b
a) X x 48 + 52 x X = 160
X x ( 48 + 52 ) = 160
X x 100 = 160
X = 160 : 100
X = 1,6
b) 7 x ( 8 + 2 x X ) = 210
8 + 2 x X = 210 : 7
8 + 2 x X = 30
2 x X = 30 - 8
2 x X = 22
X = 22 : 2
X = 11
c) X x 56 + 44 x X + 285 x X = 130
X x ( 56 + 44 + 285 ) = 130
X x 385 = 130
X = 130 : 385
X = 130/385
( X - 12 ) x 17 : 11 = 51
( X - 12 ) x 17 = 51 x 11
( X - 12 ) x 17 = 561
X - 12 = 561 : 17
X - 12 = 33
X = 33 + 12
X = 45
e) 915 x X + 285 x X = 48
X x ( 915 + 285 ) = 48
X x 1200 = 48
X = 48 : 1200
X = 0,04.
g) ( X x 7 + 8 ) : 5 = 10
X x 7 + 8 = 10 x 5
X x 7 + 8 = 50
X x 7 = 50 - 8
X x 7 = 42
X = 42 : 7
X = 6
i) ( X : 2 + 50 ) : 5 = 12
X : 2 + 50 = 12 x 5
X : 2 + 50 = 60
X : 2 = 60 - 50
X : 2 = 10
X = 10 x 2
X = 20