câu 9 ạ cô thương hoài. Tìm hiệu của ab,cd và dc,ba.
@ Cô Nguyễn Thị Thương Hoài
Em rất thích học olm và em rất thích sự nhiệt tình của cô Thương Hoài.
Em mong cô cập nhật lại nội quy của olm nhé ạ! vì các bạn cứ hay bảo chỉ đc đăng toán thôi í ạ!
Em cảm ơn cô và olm đã giúp em học tốt hơn ạ!
mình cũng có sở thichs giống bạn đã chia sẻ
Mình thì cũng thích olm với cô Thương Hoài vì cô giảng rất dễ hiểu và còn dễ làm nữa.
Thư gửi cô Nguyễn Thị Thương Hoài:
#Cảm ơn cô Hoài đã giúp em học tập tiến bộ hơn ạ!#
@Nguyễn Thị Thương Hoài
Cô oi cô tl giúp e những câu hỏi e mới gửi lên đó ạ. Cảm ơn cô nhiều ạ! Chúc cô HẠNH PHÚC ạ!
Cô làm rồi em nhá làm theo đúng cách của tiểu học luôn em nha, cảm ơn em đã tin tưởng và yêu thương olm, chúc em học tốt.
https://olm.vn/cau-hoi/cho-phan-so-ab-rut-gon-ab-ta-duoc-phan-so-la-37-neu-dem-tu-so-cua-phan-so-da-cho-cong-voi-25-va-giu-nguyen-mau-so-thi-duoc-phan-so-moi-sau-khi-r.8121397970933
câu 8 mọi người nhá. Em muốn cô thương hoài giúp em. Cô là nguoi nhiệt tình, yêu cô ạ
Bài 8: Trong 1 giờ hai người cùng làm được: 1 : 5 = \(\dfrac{1}{5}\) (công việc)
Trong 3 giờ hai người cùng làm được: \(\dfrac{1}{5}\) \(\times\) 3 = \(\dfrac{3}{5}\) (công việc)
Trong 6 giờ người thứ hai làm một mình được:
1 - \(\dfrac{3}{5}\) = \(\dfrac{2}{5}\) (công việc)
Trong 1 giờ người thứ hai làm một mình được:
\(\dfrac{2}{5}\): 6 = \(\dfrac{1}{15}\) (công việc)
Người thứ thợ thứ hai làm một mình xong công việc sau:
1 : \(\dfrac{1}{15}\) = 15 (giờ)
Đáp số: 15 giờ
Cho số thập phân ab,cd,biết a - b = b - c = c - d = 1.tìm hiệu của ab,cd và dc,ba
tìm phần số x/9 (x thuộc z) sao cho:
x/9<4/7<x+1/9
GIÚP MÌNH VỚI Ạ. MÌNH CẦN GẤP. CẢM ƠN CÁC BẠN NHIỀU!
CÔ NGUYỄN THỊ THƯƠNG HOÀI GIÚP EM VỚI Ạ
\(\dfrac{x}{9}\) < \(\dfrac{4}{7}\) < \(x\) + \(\dfrac{1}{9}\)
\(\dfrac{7x}{63}\) < \(\dfrac{36}{63}\) < \(\dfrac{63x}{63}\) + \(\dfrac{7}{63}\)
7\(x\) < 36 < 63\(x\) + 7
⇒\(\left\{{}\begin{matrix}7x< 36\\63x+7>36\end{matrix}\right.\)⇒\(\left\{{}\begin{matrix}x< \dfrac{36}{7}\\63x>36-7\end{matrix}\right.\)⇒\(\left\{{}\begin{matrix}x< \dfrac{36}{7}\\63x>29\end{matrix}\right.\)⇒\(\left\{{}\begin{matrix}x< \dfrac{36}{7}\\x>\dfrac{29}{63}\end{matrix}\right.\)
\(\dfrac{29}{63}\)< \(x\) < \(\dfrac{36}{7}\) vì \(x\in\) Z nên \(x\in\) { 1; 2; 3; 4; 5}
⇒ \(\dfrac{x}{9}\) = \(\dfrac{1}{9}\); \(\dfrac{2}{9}\); \(\dfrac{3}{9}\); \(\dfrac{4}{9}\);\(\dfrac{5}{9}\)
tìm phần số x/9 (x thuộc z) sao cho:
x/9<4/7<x+1/9
GIÚP MÌNH VỚI Ạ. MÌNH CẦN GẤP. CẢM ƠN CÁC BẠN NHIỀU!
CÔ NGUYỄN THỊ THƯƠNG HOÀI GIÚP EM VỚI Ạ
\(\dfrac{x}{9}< \dfrac{4}{7}< \dfrac{x+1}{9}\)
=>\(\dfrac{7x}{63}< \dfrac{36}{63}< \dfrac{7x+7}{63}\)
\(\Rightarrow7x< 36< 7x+7\)
\(\Rightarrow x< \dfrac{36}{7}< x+1\)
\(\Rightarrow x< 5\dfrac{1}{7}< x+1\)
\(\Rightarrow x=5\)
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cho số thập phân ab,cd biết a-b=b-c=c-d=1
tìm hiệu của ab,cd và dc,ba.
ai nhanh mình tick nha!
mong Akai Haruma;cô nguyễn thị thương hoài và mn giúp đỡ ạ
Bài 1 : (4a - b).(4a + b) = 16a2 + (-b2)
(\(x^2y\) + 2y)(\(x^2\)y - 2y = \(x^4\).y2 + (- 4y2)
(\(\dfrac{3}{4}\)\(x\) + \(\dfrac{3}{5}\)y)(\(\dfrac{3}{5}\)y - \(\dfrac{3}{4}\)\(x\)) = \(\dfrac{9}{25}\)y2 + (- \(\dfrac{9}{16}\)\(x^2\))
2; (\(x+2\))(\(x^2\) - 2\(x\) + 4) = \(x^3\) + 8
(3\(x\) + 2y)(9\(x^2\) - 6\(xy\) + 4y2) = 27\(x^3\) + 8y3
3, (5- 3\(x\))(25 + 15\(x\) + 9\(x^2\)) = 125 + ( -27\(x^3\))
(\(\dfrac{1}{2}\)\(x\) - \(\dfrac{1}{5}\)y).(\(\dfrac{1}{4}\)\(x^2\) + \(\dfrac{1}{10}\)\(xy\) + \(\dfrac{1}{25}\)y2 = \(\dfrac{1}{8}\)\(x^3\) + (-\(\dfrac{1}{125}\)y3)
cho số thập phân ab,cd biết a-b=b-c=c-d=1. Timg hiệu của ab,cd và dc,ba