Question

Tìm x :

a ) x : \([(\) 1800 + 600 \()\) : 30 \(]\) = 560 : \((\) 315 - 35 )

b ) x - 6 : 2 - ( 48 - 24 ) : 2 : 6 -3 = 0

c ) 390 - ( x - 7 ) = 169 : 13

d ) ( x - 140 ) : 7 = 3\(^3\) - 2\(^3\) . 3

Answer 1

a, x : [(1800 + 600) : 30] = 560 : (315 - 35)
<=> x : (2400 : 30) = 560 : 280
<=> x : 80 = 2
<=> x = 160
b, x - 6 : 2 - (48 - 24) : 2 : 6 - 3 = 0
<=> x - 3 - 24 : 2 : 6 - 3 = 0
<=> x - 3 - 2 - 3 = 0
<=> x - 8 = 0
<=> x = 8
c, 390 - (x - 7) = 169 : 13
<=> 390 - (x - 7) = 13
<=> x - 7 = 377
<=> x = 384
d, (x - 140) : 7 = 3³ - 2³.3
<=> (x - 140) : 7 = 3³ - 24
<=> (x - 140) : 7 = 3
<=> x - 140 = 21
<=> x = 161
@Đỗ Thị Huyền Trang

Answer 2

a) x = 160

b) x= 8

c) x = 384

d) x = 539

Answer 3

a) x:[2400:30]=560:280

x:80=2

x=2x80=160