Làm giúp mình bài 1 với ạ
K
Khách
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
Những câu hỏi liên quan
PM
1
11 tháng 5 2022
Bài 1:
Vì (d)//y=-2x+1 nên a=-2
Vậy: y=-2x+b
Thay x=1 và y=2 vào (d),ta được:
b-2=2
hay b=4
22 tháng 3 2022
a, \(2x=5\Leftrightarrow x=\dfrac{5}{2}\)
b, \(2x-1=4x-8\Leftrightarrow2x=7\Leftrightarrow x=\dfrac{7}{2}\)
c, \(3x+9-6=2x+4\Leftrightarrow x=1\)
d, \(\left[{}\begin{matrix}2x+1=0\\-3x+2=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=-\dfrac{1}{2}\\x=\dfrac{2}{3}\end{matrix}\right.\)
e, đk : x khác 0 ; 3
\(2x+8x-24=16\Leftrightarrow10x=40\Leftrightarrow x=4\left(tm\right)\)
27 tháng 8 2021
6) \(\dfrac{8^6}{256}=\dfrac{\left(2^3\right)^6}{2^8}=\dfrac{2^{18}}{2^8}=2^{10}=1024\)
7) \(\left(\dfrac{1}{2}\right)^{15}.\left(\dfrac{1}{4}\right)^{20}=\left(\dfrac{1}{2}\right)^{15}.\left[\left(\dfrac{1}{2}\right)^2\right]^{20}=\left(\dfrac{1}{2}\right)^{15}.\left(\dfrac{1}{2}\right)^{40}=\left(\dfrac{1}{2}\right)^{55}=\dfrac{1}{2^{55}}\)
8) \(\left(\dfrac{1}{9}\right)^{25}\div\left(\dfrac{1}{3}\right)^{30}=\left(\dfrac{1}{3}\right)^{50}\div\left(\dfrac{1}{3}\right)^{30}=\left(\dfrac{1}{3}\right)^{20}=\dfrac{1}{3^{20}}\)
9)\(\left(\dfrac{1}{16}\right)^3\div\left(\dfrac{1}{8}\right)^2=\left(\dfrac{1}{2}\right)^{12}\div\left(\dfrac{1}{2}\right)^6=\left(\dfrac{1}{2}\right)^6=\dfrac{1}{64}\)
10) \(\dfrac{27^2.8^5}{6^2.32^3}=\dfrac{3^6.2^{15}}{3^2.2^2.2^{15}}=\dfrac{3^4}{2^2}=\dfrac{81}{4}\)
2
MH
14 tháng 11 2021
a) \(95.\left(-13\right)+\left(-13\right).15-13.\left(-10\right)\)
\(=13.\left(-95\right)+13.\left(-15\right)-13.\left(-10\right)\)
\(=13.\left[\left(-95\right)+\left(-15\right)-\left(-10\right)\right]\)
\(=13.\left(-90\right)\)
\(=-1170\)
SB
6 tháng 7 2021
mình làm những bài bn chưa lm nhé
9B
10A
bài 2
have repainted
bàii 3
ride - walikking
swimming
watch
BG
17 tháng 12 2022
Dear My friend
I live in Ha Noi. It’s the capital of Vietnam. I’ve been living here for 5 years and I believe it’s the place that suits me most. The city has great culture to explore and offers good opportunities of career and education.People who live here is very friendly and helpful. But the crowded congested traffic is a real issue here, it’s an ideal place to meet people from over the world. It’s always changing so you’ll hardly get bored at this sleepless city.
Best regards,
(Your name)
a) \(=5\sqrt{3}+9\sqrt{3}-12\sqrt{3}-8\sqrt{3}=-6\sqrt{3}\)
b) \(=8-3\sqrt{5}-\sqrt{45-2\sqrt{500}}=8-3\sqrt{5}-\left|5-2\sqrt{5}\right|=8-3\sqrt{5}-5+2\sqrt{5}=3-\sqrt{5}\)
c) \(\dfrac{8\sqrt{6}-12}{\sqrt{6}-4}-3\sqrt{\dfrac{2}{3}}+\dfrac{12}{\sqrt{6}-2}=\dfrac{\left(8\sqrt{6}-12\right)\left(\sqrt{6}+4\right)}{-10}-\sqrt{3}.\sqrt{2}+\dfrac{12\left(\sqrt{6}+2\right)}{2}=\dfrac{20\sqrt{6}}{-10}-\sqrt{6}+6\left(\sqrt{6}+2\right)=-2\sqrt{6}-\sqrt{6}+6\sqrt{6}+12=12+3\sqrt{6}\)