a) \(49-7\left(13-x\right)=14\)
\(\Leftrightarrow7\left(13-x\right)=35\)
\(\Leftrightarrow13-x=5\)
\(\Leftrightarrow x=8\)
b) \(5x-25=10\)
\(\Leftrightarrow5x=35\)
\(\Leftrightarrow x=7\)
bạn tự làm tiếp nha!......^^
a) 49 - 7(13 - x) = 14
=> -7(13 - x) = -35
=> 13 - x = 5
=> x = 8
b) 5x - 25 = 10
=> 5x = 35
=> x = 7
c) 14x - 2.49 = 6.7
=> 14x - 98 = 42
=> 14x = 140
=> x = 10
d) 9x + 2.9 = 27
=> 9x + 18 = 27
=> 9x = 9
=> x = 1
e) 10x + 4.5 = 100
=> 10x + 20 = 100
=> 10x = 80
=> x = 8
chúc pn hc tốt!!!
49 - 7. ( 13 - x ) = 14 9.x + 2.9 = 27
7. ( 13 - x ) = 49 - 14 = 35 9. ( x + 2 ) = 27
13 - x = 35 : 7 = 5 x + 2 = 27 : 9 = 3
x = 13 - 5 x = 3 - 2
x = 8 x = 1
5.x - 15 = 10 10.x + 4.5 = 100
5.x = 10 + 15 = 35 10.x + 20 = 100
x = 35 : 5 10.x = 100 - 20 = 80
x = 7 x = 80 : 10
14 . x - 2 . 49 = 6.7 x = 8 .
14 . x - 98 = 42
14 . x = 42 + 98 = 140
x = 140 : 14
x = 10
49-7.(13-x)=14 5x-25=10 14x-2.49=6.7 9x+2.9=27 10x+4.5=100
7.(13-x)=49-14 5x=10+25 14x-2.49=42 9x+18=27 10x+20=100
7.(13-x)=35 5x=35 14x-98=42 9x=27-18 10x=100-20
13-x=35:7=5 x=35:5 14x=42+98=140 9x=9 10x=80
x=13-5=8 x=7 x=140:14=10 x=9:9=1 x=80:10=8
vậy x=8 vậy x=7 vậy=10 vậy x=1 vẫy=8
Tìm số nguyên x, biết:
x - (25 - x) = x - 13
