âu 5: Tìm thỏa mãn:
(33)2 + 2x = 5.(45 + 22.25) + 8
36 + 2x = 5.145 + 8
729 + 2x = 725 + 8
725 + 4 + 2x = 725 + 8
\(\Rightarrow\) 4 + 2x = 8
2x = 8 - 4
2x = 4
2x = 22
\(\Rightarrow\) x = 2
Vậy x = 2
tìm x biết:
(2x-7)-135=0
122+(37-3x)=0
Cho 2 biểu thức :
\(A=\dfrac{34}{7.13}+\dfrac{51}{13.22}+\dfrac{85}{22.37}+\dfrac{68}{37.49}\)
\(B=\dfrac{39}{7.16}+\dfrac{65}{16.31}+\dfrac{52}{31.43}+\dfrac{26}{43.49}\)
Tính tỉ số \(\dfrac{A}{B}\)
Help me!!!!!!!!!!!!!!!
Câu 1:Tính
a 4.52-3.(24-9)
b 7+6.(1https:https:https://LogaVN.net/image/faq/data2/710107_.https://LogaVN.net/image/faq/data2/710107_.LogaVN.nethttps://LogaVN.net/image/faq/data2/710107_.imagehttps://LogaVN.net/image/faq/data2/710107_.faqhttps://LogaVN.net/image/faq/data2/710107_.data2https://LogaVN.net/image/faq/data2/710107_.185200_.https:https://LogaVN.net/image/faq/data2/710107_.https://LogaVN.net/image/faq/data2/710107_.LogaVN.nethttps://LogaVN.net/image/faq/data2/710107_.imagehttps://LogaVN.net/image/faq/data2/710107_.faqhttps://LogaVN.net/image/faq/data2/710107_.data2https://LogaVN.net/image/faq/data2/710107_.185200_.LogaVN.nethttps:https://LogaVN.net/image/faq/data2/710107_.https://LogaVN.net/image/faq/data2/710107_.LogaVN.nethttps://LogaVN.net/image/faq/data2/710107_.imagehttps://LogaVN.net/image/faq/data2/710107_.faqhttps://LogaVN.net/image/faq/data2/710107_.data2https://LogaVN.net/image/faq/data2/710107_.185200_.imagehttps:https://LogaVN.net/image/faq/data2/710107_.https://LogaVN.net/image/faq/data2/710107_.LogaVN.nethttps://LogaVN.net/image/faq/data2/710107_.imagehttps://LogaVN.net/image/faq/data2/710107_.faqhttps://LogaVN.net/image/faq/data2/710107_.data2https://LogaVN.net/image/faq/data2/710107_.185200_.faqhttps:https://LogaVN.net/image/faq/data2/710107_.https://LogaVN.net/image/faq/data2/710107_.LogaVN.nethttps://LogaVN.net/image/faq/data2/710107_.imagehttps://LogaVN.net/image/faq/data2/710107_.faqhttps://LogaVN.net/image/faq/data2/710107_.data2https://LogaVN.net/image/faq/data2/710107_.185200_.data2https:https://LogaVN.net/image/faq/data2/710107_.https://LogaVN.net/image/faq/data2/710107_.LogaVN.nethttps://LogaVN.net/image/faq/data2/710107_.imagehttps://LogaVN.net/image/faq/data2/710107_.faqhttps://LogaVN.net/image/faq/data2/710107_.data2https://LogaVN.net/image/faq/data2/710107_.185200_.775362_.2)2
c 25.7+25
Câu 2:Tìm x
a (x-15):5+22=24
b |x+7|=15-(-4)
c 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Câu 3:
1)Cho A= 1-2+3-4+5-6+...+99-100
a Tính A
b A có chia hết cho 2,3 và 5 không?
c A có bao nhiêu ước tụ nhiên? bao nhiêu ước nguyên?
2)Thay a,b bàng các chữ số thích ợp sao cho:24a68b chia hết cho 45
3)Cho a là một số nguyen có dạng a=3b+7(b thuộc Z)
Hỏi a có thể nhận được những giá trị nào?tại sao?
a=11 a=2002 a=2003 a=11570 a=22789 a=29563 a=299537
Câu 4:
a Tìm số tự nhiên nhỏ nhất sao cho số đó chia 9 dư 5 chia 7 dư 4 chia 5 dư 3
b Cho A=1+20122+20123+...+201272
B=201273-1
So sánh A với B
Trên nửa mặt phẳng bờ chứa ria õ,vẽ hai tia oy và oz sao cho xoy=20; xoz=100 a) Tính góc yOz b) Vẽ tia Ot là tia đối của tia Õ. Chứng tỏ Oz là phân giác của góc toy (adsbygoogle = window.adsbygoogle || []).push({}); Câu trả lời (1) Cũ nhất Mới nhât Thích nhiều /* load placement for account: congha, site: LogaVN.net, zone size : 640x1280 */ if( /Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(navigator.userAgent) ) { // ambient mobile code document.write('var _ase = _ase || [];_ase.push(["1494486971","1494487867"]);'); } /* day la banner outstream video : LogaVN.net.iTVC.2.0.txt */ if( /Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(navigator.userAgent) ) { // ambient mobile code } else { var abd_media = "media.adnetwork.vn"; var abd_width = 500; /*width of video player*/ var abd_height = 281; /*height of video player*/ var abd_skip =7; var abd_flash =false; var abd_popup = true; var abd_wid =1494486632; var abd_zid =1494486666; var abd_content_id = "#itvc20player"; /*.class or #id of content wrapper*/ var abd_position=1; /*the paragraph position where ads display*/ }
a) Trên một nửa mặt phẳng bờ chứa tia Ox, vì \(\widehat{xOy}\) < \(\widehat{xOz}\) (20o < 100o) nên tia Oy nằm giữa hai tia Ox và Oz.
Vì tia Oy nằm giữa hai tia Ox và Oz nên ta có:
\(\widehat{xOy}\) + \(\widehat{yOz}\) = \(\widehat{xOz}\)
20o + \(\widehat{yOz}\) = 100o
\(\widehat{yOz}\) = 100o - 20o = 80o
b) \(\widehat{xOt}\) là góc bẹt (góc có hai cạnh là hai tia đối nhau)
Trên một nửa mặt phẳng bờ chứa tia Ox, vì \(\widehat{xOy}\) < \(\widehat{xOz}\) < \(\widehat{xOt}\) (20o < 100o < 180o) nên tia Oz nằm giữa hai tia Oy và Ot.
Ta thấy \(\widehat{xOz}\) và \(\widehat{zOt}\) kề bù
\(\Rightarrow\) \(\widehat{zOt}\) = 180o - \(\widehat{xOz}\) = 180o - 100o = 80o
Tia Oz là tia phân giác của \(\widehat{tOy}\) vì:
+ Tia Oz nằm giữa hai tia Oy và Ot
+ \(\widehat{yOz}\) = \(\widehat{zOt}\) = 80o
Nếu bạn hỏi, bạn chỉ thu về một câu trả lời. Nhưng khi bạn suy nghĩ trả lời, bạn sẽ thu về gấp bội!
Mời gia nhập Biệt đội Ninja247
Tìm x :
a) 3x + 5 chia hết cho x-1
b)7x - 6 chia hết cho x + 2
Giúp mình nha
Cho A = 20+21+22+23+...+2100 . Hỏi A chia cho 100 dư bao nhiêu?
Giúp mk với! Trình bày chi tiết nhé!
x/7=x-12/21
Tìm x biết:
x-\(\dfrac{1}{2}=\dfrac{-5}{8}\)
b) \(\dfrac{2}{5}+\dfrac{3}{5}.\left(x-2\right)=\dfrac{-1}{6}\)
Cho biết A = 22017
và B = ( 1 + 2 + 22 + 23 + ... + 22015 + 22016 ) So sánh A và B
Giúp mình với !!!
Một nền nhà hình chữ nhật có chiều dài 8m , chiều rộng 6m. Người ta muốn lát kín nền nhà bằng cùng một loại gạch hình vuông. Có 2 loại gạch: gạch 30cm x 30cm và gạch 40cm x 40cm ( các viên gạch được lát liền nhau, coi như không có khe hở )
a) Hỏi người ta phải dùng loại gạch nào thì có thể lát vừa vặn nền nhà ?
b) Lúc đó cần bao nhiêu viên gạch như trên để lát kín nền nhà ?
Giúp mình với
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