15 . ( 3 + 42 : x ) = 135
3 + 42 : x = 135 : 15
42 : x = 9 - 3
42 : x = 6
x = 42 : 6
x = 7
3+42:x=135:15
3+42:x=9
42:x=9-3
42:x=6
x=42:6
x=7
\(\left(3+42:x\right)=135:15\)
\(\left(3+42:x\right)=9\)
\(42:x=9-3\)
\(42:x=6\)
\(x=42:6\)
\(x=7\)
15 . ( 3 + 42 : x ) = 135
( 3 + 42 : x ) = 135 : 15
( 3 + 42 : x ) = 9
42 : x = 9 - 3
42 : x = 6
x = 7
Vậy x = 7
15.(3+42:x)=135
15.(3+42:x)=135:15
(3+42:x)=9
(3+42:x)=3+42
(3+42:x)=45
x=45:9
x=5
3+42:x=9
suy ra:42:x=6
suy ra:x=42:6
suy ra:x=7
Vay x=7
Tìm x ∈N :
15 . ( 3 + 42 : x ) = 135
3 + 42 : x = 135 :15
3 + 42 : x = 9
42 : x = 9 - 3
42 : x = 6
x = 42 : 6
x = 7
(3 + 42 :x) = 135 : 15
(3+42:x)=9
42:x=9-3
42:x=6
x=42:6
x=7
Mong các bạn ủng hộ mk
15*(3+42/x)=135
3+42/x=135/15=9
42/x=9-3=6
x=42/6=7
câu trả lời như sau
15.(3+42:x)=135
3+42:x=135:15
3+42:x=9
42:x=9-3
42:x=6
x=42:6
x=7
vậy x=7 thỏa mãn đề bài
