Bài 1 a, 44 + 7.x = 10 mũ 3 ; 10 b, 131 . x – 911 = 2 mũ 7 – 2 mũ 3 17/08/2021 Bởi Adalyn Bài 1 a, 44 + 7.x = 10 mũ 3 ; 10 b, 131 . x – 911 = 2 mũ 7 – 2 mũ 3
a) $44+7x=10^3:10=10^=100$ $7x=100-44=56$ $⇒x=\dfrac{56}{7}$ Vậy $x=\dfrac{56}{7}$ b) $131x-911=2^7-2^3$ $131x-911=128-8=120$ $131x=120+911=1031$ $⇒x=\dfrac{1031}{131}$ Vậy $x=\dfrac{1031}{131}$ Bình luận
a, 44 + 7 . x = 10³ 7x = 1000 – 44 7x = 956 x = `956/7` x = `956/7` Vậy x = `956/7` b, 131 . x – 911 = $2^{7}$ – $2^{3}$ 131x – 911 = 128 – 8 131x = 120 131x = 1031 x = `1031/131` Vậy x = `1031/131` Bình luận
a) $44+7x=10^3:10=10^=100$
$7x=100-44=56$
$⇒x=\dfrac{56}{7}$
Vậy $x=\dfrac{56}{7}$
b) $131x-911=2^7-2^3$
$131x-911=128-8=120$
$131x=120+911=1031$
$⇒x=\dfrac{1031}{131}$
Vậy $x=\dfrac{1031}{131}$
a, 44 + 7 . x = 10³
7x = 1000 – 44
7x = 956
x = `956/7`
x = `956/7`
Vậy x = `956/7`
b, 131 . x – 911 = $2^{7}$ – $2^{3}$
131x – 911 = 128 – 8
131x = 120
131x = 1031
x = `1031/131`
Vậy x = `1031/131`