tính nhanh
\(\dfrac{18}{45}\)+\(\dfrac{16}{12}\)+\(\dfrac{6}{30}\)-\(\dfrac{6}{9}\)-\(\dfrac{21}{35}\)
mng làm nhanh lên nhé. mình đang cần gấp 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
11 tháng 2 2022
\(E=\dfrac{-1}{3}-\dfrac{2}{3}+\dfrac{2}{5}-\dfrac{3}{5}+\dfrac{1}{5}=-1\)
14 tháng 7 2021
Ta có: \(\dfrac{-4}{12}+\dfrac{18}{45}+\dfrac{-6}{9}+\dfrac{21}{35}+\dfrac{6}{30}\)
\(=\dfrac{-1}{3}+\dfrac{-2}{3}+\dfrac{2}{5}+\dfrac{3}{5}+\dfrac{6}{30}\)
\(=-1+1+\dfrac{1}{5}\)
\(=\dfrac{1}{5}\)
AH
Akai Haruma
Giáo viên
28 tháng 6 2023
Lời giải:
$=\frac{-9}{10}+\frac{13}{10}+(\frac{6}{11}-\frac{9}{11})$
$=\frac{13-9}{10}+\frac{6-9}{11}=\frac{4}{10}-\frac{3}{11}$
$=\frac{7}{55}$
LT
5
14 tháng 2 2022
\(\dfrac{7}{21}+\dfrac{-9}{36}=\dfrac{1}{3}+\dfrac{-1}{4}=\dfrac{4}{12}+\dfrac{-3}{12}=\dfrac{1}{12}\)
\(\dfrac{-12}{18}+\dfrac{-21}{35}=\dfrac{-2}{3}+\dfrac{-3}{5}=\dfrac{-10}{15}+\dfrac{-9}{15}=\dfrac{-19}{15}\)
\(\dfrac{-18}{14}+\dfrac{15}{-21}=\dfrac{-9}{7}+\dfrac{-5}{7}=\dfrac{-14}{7}=-2\)
\(\dfrac{3}{21}+\dfrac{-6}{42}=\dfrac{1}{7}+\dfrac{-1}{7}=0\)
S
20 tháng 4 2023
\(x+\dfrac{1}{5}-\dfrac{3}{7}=\dfrac{6}{35}\)
\(x+\dfrac{1}{5}=\dfrac{6}{35}+\dfrac{3}{7}\)
\(x+\dfrac{1}{5}=\dfrac{6}{35}+\dfrac{15}{35}\)
\(x+\dfrac{1}{5}=\dfrac{21}{35}\)
\(x=\dfrac{21}{35}-\dfrac{1}{5}\)
\(x=\dfrac{21}{35}-\dfrac{7}{35}\)
\(x=\dfrac{14}{35}=\dfrac{2}{5}\)
NT
Nguyễn Thị Thương Hoài
Giáo viên
VIP
20 tháng 4 2023
\(x\) + \(\dfrac{1}{5}\) - \(\dfrac{3}{7}\) = \(\dfrac{6}{35}\)
\(x\) + \(\dfrac{1}{5}\) = \(\dfrac{6}{35}\) + \(\dfrac{3}{7}\)
\(x\) + \(\dfrac{1}{5}\) = \(\dfrac{3}{5}\)
\(x\) = \(\dfrac{3}{5}\) - \(\dfrac{1}{5}\)
\(x\) =\(\dfrac{2}{5}\)
9 tháng 4 2022
\(=\dfrac{\sqrt{a}+2+\sqrt{a}-2}{a-4}:\dfrac{\sqrt{a}+2-2}{\sqrt{a}+2}\)
\(=\dfrac{2\sqrt{a}}{a-4}\cdot\dfrac{\sqrt{a}+2}{\sqrt{a}}=\dfrac{2}{\sqrt{a}-2}\)
\(\dfrac{18}{45}\) + \(\dfrac{16}{12}\) + \(\dfrac{6}{30}\) - \(\dfrac{6}{9}\) - \(\dfrac{21}{35}\)
= \(\dfrac{2}{5}\) + \(\dfrac{4}{3}\) + \(\dfrac{1}{5}\) - \(\dfrac{2}{3}\) - \(\dfrac{3}{5}\)
= (\(\dfrac{2}{5}\) + \(\dfrac{1}{5}\) - \(\dfrac{3}{5}\)) + (\(\dfrac{4}{3}\) - \(\dfrac{2}{3}\))
= (\(\dfrac{3}{5}\) - \(\dfrac{3}{5}\)) + \(\dfrac{2}{3}\)
= 0 + \(\dfrac{2}{3}\)
= \(\dfrac{2}{3}\)
18454518 + 16121216 + 630306 - 6996 - 21353521
= 2552 + 4334 + 1551 - 2332 - 3553
= (2552 + 1551 - 3553) + (4334 - 2332)
= (3553 - 3553) + 2332
= 0 + 2332
= 2332