Toán Lớp 6: Bài 5: Tìm x biết :
a) x + 37 = 50 b) 2× x – 3 = 11
c) (2 + x ) : 5 = 6 d) 2 + x : 5 = 6
e) x3 = 27 f) 2 x + 5 =3⁴ : 3²
Leave a reply
Register Now
Login
Lost Password
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Toán Lớp 6: Bài 5: Tìm x biết :
a) x + 37 = 50 b) 2× x – 3 = 11
c) (2 + x ) : 5 = 6 d) 2 + x : 5 = 6
e) x3 = 27 f) 2 x + 5 =3⁴ : 3²
Comments ( 2 )
$@Zeng$
a)x+37=50
x=50-37
x=13
b)2×x-3=11
2×x=11+3
2×x=14
x=14:2
x=7
c)(2+x):5=6
2+x=6×5
2+x=30
x=30-2
x=28
d)2+x:5=6
x:5=6-2
x:5=4
x=4×5
x=20
e)x×3=27
x=27:3
x=9
f)2x+5=3^4:3²
2x+5=3²
2x+5=9
2x=9-5
2x=4
x=4:2
x=2
Giải đáp:
$a)$ $x=13$
$b)$ $x=7$
$c)$ $x=28$
$d)$ $x=20$
$e)$ $x=9$
$f)$ $x=2$
Lời giải và giải thích chi tiết:
$a)$ $ x+37=50$
=> $x=50-37$
=> $x=13$
$\text{Vậy}$ $x=13$
$b)$ $2.x-3=11$
=> $2.x=11+3$
=> $2.x=14$
=> $x=14:2$
=> $x=7$
$\text{Vậy}$ $x=7$
$c)$ $(2 + x ) : 5 = 6$
=> $(2+x)=6.5$
=> $2+x=30$
=> $x=30-2$
=> $x=28$
$\text{Vậy}$ $x=28$
$d)$ $2 + x : 5 = 6$
=> $x:5=6-2$
=> $x:5=4$
=> $x=4.5$
=> $x=20$
$\text{Vậy}$ $x=20$
$e)$ $3x = 27$
=> $x=27:3$
=> $x=9$
$\text{Vậy}$ $x=9$
$f)$ $2x+5=$ $3^{4}:$ $3^{2}$
=> $2x+5=$ $3^{2}$
=> $2x+5=9$
=> $2x=9-5$
=> $2x=4$
=> $x=4:2$
=> $x=2$
$\text{Vậy}$ $x=2$
@blink2k9