Toán Lớp 6: Tìm x
Bài 1 a, 2-x=17-(-5)
Bài 1 b, x/7=6/21
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Toán Lớp 6: Tìm x
Bài 1 a, 2-x=17-(-5)
Bài 1 b, x/7=6/21
giúp mình
Comments ( 2 )
Bài 1
a ) 2 – x = 17 – (-5)
=> 2 – x = 22
=> x = 2 – 22
=> x = -20
Vậy x = -20
Bài 2
b ) x/7 = 6/21
=> x = 6 . 7 : 21
=> x = 2
Vậy x = 2
#dtkc
$\text{ Bài 1:}$
a, 2 – x = 17 – ( -5)
2 – x = 17 + 5
2 – x = 22
x = 2 – 22
x = – 20
$\text{ Vậy x = – 20}$
b, $\frac{x}{7}$ =$\frac{6}{21}$
⇔ $\frac{x}{7}$ = $\frac{2}{7}$
⇔ x = 2
$\text{ Vậy x = 2}$