HOC24
Lớp học
Môn học
Chủ đề / Chương
Bài học
modern: more modern
thoughtful: more thoughtful
boring: more boring
A. move - to
careful
Write about your summer vacation 80 words(10pts)
(Don’t show your name, your school or your village):
C.dân ca Quan họ Bắc Ninh
TK :
Ta có A = 5 + 52 + 53 + ... + 52021
5A = 52 + 53 + 54 + ... + 52022
5A - A = ( 52 + 53 + 54 + ... + 52022 ) - ( 5 + 52 + 53 + ... + 52021 )
4A = 52022 - 5
Vậy 4A + 5 = 52022 - 5 + 5 = 52022
A . âm 2
B . âm 2
C . âm 1
D . âm 2
Chọn C
1 . footer
2. channel
A
a,18(x−16)=−36a,18(x-16)=-36
⇒x−16=−36:18⇒x-16=-36:18
⇒x−16=−2⇒x-16=-2
⇒x=−2+16⇒x=-2+16
⇒x=14⇒x=14
b,(−12−x):(−5)=3b,(-12-x):(-5)=3
⇒−12−x=3.(−5)⇒-12-x=3.(-5)
⇒−12−x=−15⇒-12-x=-15
⇒x=−12−(−15)⇒x=-12-(-15)
⇒x=−12+15⇒x=-12+15
⇒x=3⇒x=3
c,11−(−53+x)=97c,11-(-53+x)=97
⇒−53+x=11−97⇒-53+x=11-97
⇒−53+x=−86⇒-53+x=-86
⇒x=−86−(−53)⇒x=-86-(-53)
⇒x=−86+53⇒x=-86+53
⇒x=−33⇒x=-33
d,−9.x+(−7).x=−48d,-9.x+(-7).x=-48
⇒[−9+(−7)].x=−48⇒[-9+(-7)].x=-48
⇒−16.x=−48⇒-16.x=-48
⇒x=−48:(−16)⇒x=-48:(-16)
e,(2x−1)3=−27e,(2x-1)3=-27
⇒ (2x−1)3=−33⇒ (2x-1)3=-33
⇒2x−1=−3⇒2x-1=-3
⇒2x=−3+1⇒2x=-3+1
⇒2x=−2⇒2x=-2
⇒x=−2:2⇒x=-2:2
⇒x=−1