giúp e với ạ,khó quá
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VM
mọi người giúp e với hnay e gặp quá nhiều bài khó nên rất nguy mong mọi người giúp đỡ ạ
2
6 tháng 2 2022
a: =>x-4=0 hoặc x+5=0
=>x=4 hoặc x=-5
b: =>39/7:x=13
hay x=3/7
c: \(\Leftrightarrow\left(4.5-2x\right)=\dfrac{11}{4}:\dfrac{4}{9}=\dfrac{99}{16}\)
\(\Leftrightarrow2x=-\dfrac{27}{16}\)
hay x=-27/32
d: \(\Leftrightarrow x\cdot\dfrac{19}{15}=684\)
hay x=540
OP
6 tháng 2 2022
a. \(\left[{}\begin{matrix}x-4=0\\x+5=0\end{matrix}\right.\)
\(\Leftrightarrow\left[{}\begin{matrix}x=4\\x=-5\end{matrix}\right.\)
b.\(\Leftrightarrow\dfrac{39}{7}:x=13\)
\(\Leftrightarrow x=13.\dfrac{39}{7}\)
\(\Leftrightarrow x=\dfrac{507}{7}\)
c.\(\Leftrightarrow4,5-2x=\dfrac{99}{16}\)
\(\Leftrightarrow-2x=\dfrac{27}{16}\)
\(\Leftrightarrow x=-\dfrac{27}{32}\)
NT
4
24 tháng 6 2021
Bài 5:
1) \(\left(5+7\right)\left(7-5\right)=7^2-5^2\)
2) \(\left(x+y\right)\left(y-x\right)=y^2-x^2\)
3) \(\left(x-y\right)\left(-x-y\right)=-\left(x+y\right)\left(x-y\right)=-\left(x^2-y^2\right)=y^2-x^2\)
6) \(\left(2+3x^2\right)\left(3x^2-2\right)=9x^4-4\)
7) \(\left(\dfrac{1}{2}+x\right)\left(-x+\dfrac{1}{2}\right)=\left(\dfrac{1}{2}+x\right)\left(\dfrac{1}{2}-x\right)=\dfrac{1}{4}-x^2\)
8) \(\left(4m-5n\right)\left(5n+4m\right)=\left(4m-5n\right)\left(4m+5n\right)=16m^2-25n^2\)
9) \(\left(7a+1\right)\left(1-7a\right)=\left(1+7a\right)\left(1-7a\right)=1-49a^2\)
10) \(\left(1+9\right)\left(1-9\right)=1-9^2\)
NV
Nguyễn Việt Lâm
Giáo viên
10 tháng 9 2021
\(2\overrightarrow{MA}+\overrightarrow{BM}+\overrightarrow{MC}=k.\overrightarrow{BC}\Leftrightarrow2\overrightarrow{MA}+\overrightarrow{BC}=k.\overrightarrow{BC}\)
\(\Leftrightarrow2\overrightarrow{MA}=\left(k-1\right)\overrightarrow{BC}\)
\(\Leftrightarrow\overrightarrow{MA}=\left(\dfrac{k-1}{2}\right)\overrightarrow{BC}\)
\(\Leftrightarrow\overrightarrow{MA}\) cùng phương \(\overrightarrow{BC}\)
\(\Rightarrow\) Tập hợp M là đường thẳng qua A và song song BC
NQ
0
DT
Đỗ Thanh Hải
CTVVIP
21 tháng 8 2021
1 not going on holiday with you
2 such easy questions that all the students got them right
3 we had had time, we would have visited the museum
4 to Daisy for breaking her vase
5 studying ENglish 5 years ago
6 are thought to be the most popular dance in Brazil
7 sooner had she received the exam result than she phoned her mom
8 It was the absence of leadership that caused most of the problems on the committee
9 you have any complants about the product, return it to the shop
10 The more fondness for the game increased , the more proficiency he has
11 been a dramatical rise in house prices this year
12 believed to have escaped in a stolen car
13 gone out with him for 2 years
14 he was going to meet his sister in front of the station
DT
Đỗ Thanh Hải
CTVVIP
18 tháng 8 2021
1 have got nothing in common
2 put up with his rude
3 everything except the
4 on the verge of speeding
5 has not changed since
6 the moment we arrive
7 set his heart to become
8 is on the tip of my tongue
9 She was caught to smoke in the bathroom
10 He congratulated them on winning the race
11 had arrived on time
12 looking forward to using
13 prevented the visitors from being
14 could have broken into
15 has a extreme command of
16 expressed their disapproval of