tìm \(x \):
a] \(x \)/13+15/26=46/52
b] 4/7 x \(x\)=15/28
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
BT
2
9 tháng 8 2017
A) x/13+15/26=46/52
x/13+15/26=23/26
x/13=23/26-15/26
x/13=4/13
x=4
2 tháng 5 2018
x/3 + 15/26 = 46/52
x/13 + 15/26 = 23/26
x/13 = 23/26 - 15/26
x/13 = 4/13
Có x/13 = 4/13
Suy ra : x = 4
Vậy x = 4
BT
2
K
24 tháng 6 2015
Nhầm, làm lại nhé!
\(\frac{x}{13}+\frac{15}{26}=\frac{46}{52}\)
\(\frac{x}{13}+\frac{15}{26}=\frac{23}{26}\)
\(\frac{x}{13}=\frac{23}{26}-\frac{15}{26}\)
\(\frac{x}{13}=\frac{23}{26}-\frac{15}{26}\)
\(\frac{x}{13}=\frac{4}{13}\)
\(\Rightarrow x=\frac{13.4}{13}=4\)
Vậy \(x=4\)
14 tháng 6 2021
Giải:
\(9-3\times\left(x-9\right)=6\)
\(3\times\left(x-9\right)=9-6\)
\(3\times\left(x-9\right)=3\)
\(x-9=3:3\)
\(x-9=1\)
\(x=1+9\)
\(x=10\)
\(4+6\times\left(x+1\right)=70\)
\(6\times\left(x+1\right)=70-4\)
\(6\times\left(x+1\right)=66\)
\(x+1=66:6\)
\(x+1=11\)
\(x=11-1\)
\(x=10\)
\(\dfrac{x}{13}+\dfrac{15}{26}=\dfrac{46}{52}\)
\(\dfrac{x}{13}=\dfrac{23}{26}-\dfrac{15}{26}\)
\(\dfrac{x}{13}=\dfrac{4}{13}\)
\(\Rightarrow x=4\)
\(\dfrac{11}{14}-\dfrac{3}{x}=\dfrac{5}{14}\)
\(\dfrac{3}{x}=\dfrac{11}{14}-\dfrac{5}{14}\)
\(\dfrac{3}{x}=\dfrac{3}{7}\)
\(\Rightarrow x=7\)
\(5\times\left(3+7\times x\right)=40\)
\(3+7\times x=40:5\)
\(3+7\times x=8\)
\(7\times x=8-3\)
\(7\times x=5\)
\(x=5:7\)
\(x=\dfrac{5}{7}\)
\(x\times6+12:3=120\)
\(x\times6+4=120\)
\(x\times6=120-4\)
\(x\times6=116\)
\(x=116:6\)
\(x=\dfrac{58}{3}\)
\(x\times3,7+x\times6,3=120\)
\(x\times\left(3,7+6,3\right)=120\)
\(x\times10=120\)
\(x=120:10\)
\(x=12\)
\(\left(15\times24-x\right):0,25=100:\dfrac{1}{4}\)
\(\left(360-x\right):0,25=400\)
\(360-x=400.0,25\)
\(360-x=100\)
\(x=360-100\)
\(x=260\)
\(71+65\times4=\dfrac{x+140}{x}+260\)
\(\left(x+140\right):x+260=71+260\)
\(x:x+140:x+260=331\)
\(1+140:x+260=331\)
\(140:x=331-1-260\)
\(140:x=70\)
\(x=140:70\)
\(x=2\)
\(\left(x+1\right)+\left(x+4\right)+\left(x+7\right)+...+\left(x+28\right)=155\)
\(10\times x+\left(1+4+7+...+28\right)=155\)
Số số hạng \(\left(1+4+7+...+28\right)\) :
\(\left(28-1\right):3+1=10\)
Tổng dãy \(\left(1+4+7+...+28\right)\) :
\(\left(1+28\right).10:2=145\)
\(\Rightarrow10\times x+145=155\)
\(10\times x=155-145\)
\(10\times x=10\)
\(x=10:10\)
\(x=1\)
Đều theo cách lớp 5 nha em!
26 tháng 9 2018
\(\frac{x}{27}-\frac{2}{9}=\frac{6}{18}\)
\(\frac{x}{27}=\frac{6}{18}-\frac{2}{9}\)
\(\frac{x}{27}=\frac{3}{9}-\frac{2}{9}\)
\(\frac{x}{27}=\frac{1}{9}\)
\(\frac{x}{27}=\frac{3}{27}\)
\(x=3\)
26 tháng 9 2018
Ấy nhầm, làm lại nha:
\(\frac{x}{27}-\frac{2}{9}=\frac{6}{18}\)
\(\frac{x}{27}=\frac{6}{18}+\frac{2}{9}\)
\(\frac{x}{27}=\frac{3}{9}+\frac{2}{9}\)
\(\frac{x}{27}=\frac{5}{9}\)
\(\frac{x}{27}=\frac{15}{27}\)
\(x=15\)
GV
4
GN
GV Nguyễn Trần Thành Đạt
Giáo viên
21 tháng 9 2023
\(2x+3=15\\ \Rightarrow2x=15-3=12\\ \Rightarrow x=\dfrac{12}{2}=6\\ ---\\ 28-3x=13\\ \Rightarrow3x=28-13=15\\ \Rightarrow x=\dfrac{15}{3}=5\\ ---\\ \left(x-1954\right).5=50\\ \Rightarrow x-1954=50:5=10\\ \Rightarrow x=10+1954=1964\\ ---\\ x-152:2=46\\ \Rightarrow x-76=46\\ \Rightarrow x=46+76=122\)
NT
Nguyễn Thị Thương Hoài
Giáo viên
VIP
21 tháng 9 2023
a, 2\(x\) + 3 = 15
2\(x\) = 12
\(x\) = 6
b, 28 - 3\(x\) = 13
3\(x\) = 28 - 13
3\(x\) = 15
\(x\) = 5
6 tháng 8 2019
\(\frac{x}{13}:\frac{15}{16}=\frac{46}{52}\)
\(\Rightarrow\frac{x}{13}=\frac{46}{52}\cdot\frac{15}{16}=\frac{23}{26}\cdot\frac{15}{16}\)
\(\Rightarrow\frac{x}{13}=\frac{345}{416}\)
\(\Rightarrow x=\frac{345}{416}\cdot13=\frac{345}{32}\)
Vậy \(x=\frac{345}{32}\)
K MK ĐI. ~ HỌC TỐT NHA ~
XO
6 tháng 8 2019
\(\frac{x}{13}:\frac{15}{16}=\frac{46}{52}\)
\(\Rightarrow\frac{x}{13}:\frac{15}{16}=\frac{23}{26}\)
\(\Rightarrow\frac{x}{13}=\frac{23}{26}\times\frac{15}{16}\)
\(\Rightarrow\frac{x}{13}=\frac{345}{416}\)
\(\Leftrightarrow416\times x=13\times345\)
\(\Rightarrow416\times x=4485\)
\(\Rightarrow x=4485:416\)
\(\Rightarrow x=\frac{345}{32}\)
NT
16 tháng 3 2018
a) \(\left(x+\frac{1}{4}-\frac{1}{3}\right):\left(2+\frac{1}{6}-\frac{1}{4}\right)=\frac{7}{46}\)
\(\left(x-\frac{1}{12}\right):\left(2-\frac{1}{12}\right)=\frac{7}{46}\)
\(\left(x-\frac{1}{12}\right):\frac{23}{12}=\frac{7}{46}\)
\(x-\frac{1}{12}=\frac{7}{46}.\frac{23}{12}\)
\(x-\frac{1}{12}=\frac{7}{24}\)
\(x=\frac{7}{24}+\frac{1}{12}\)
\(x=\frac{3}{8}\)
Vậy \(x=\frac{3}{8}\)
b) \(\frac{13}{15}-\left(\frac{13}{21}+x\right).\frac{7}{12}=\frac{7}{10}\)
\(\frac{13}{15}-\left(\frac{13}{21}+x\right)=\frac{7}{10}:\frac{7}{12}\)
\(\frac{13}{15}-\left(\frac{13}{21}+x\right)=\frac{7}{10}.\frac{12}{7}\)
\(\frac{13}{15}-\left(\frac{13}{21}+x\right)=\frac{6}{5}\)
\(\frac{13}{21}+x=\frac{13}{15}-\frac{6}{5}\)
\(\frac{13}{21}+x=\frac{-1}{3}\)
\(x=\frac{-1}{3}-\frac{13}{21}\)
\(x=\frac{-20}{21}\)
Vậy \(x=\frac{-20}{21}\)
a) \(\frac{x}{13}+\frac{15}{26}=\frac{46}{52}\)
\(\Rightarrow\frac{104x}{1352}+\frac{780}{1352}=\frac{1196}{1352}\)
\(\Rightarrow104x+780=1196\)
\(\Rightarrow104x=416\)
\(\Rightarrow x=4\)
Vậy: \(x=4\)
b) \(\frac{4x}{7}=\frac{15}{28}\)
\(\Rightarrow4x=\frac{15.7}{28}\)
\(\Rightarrow4x=\frac{15}{4}\)
\(\Rightarrow x=\frac{15}{16}\)
Vậy: \(x=\frac{15}{16}\)
thank còn bài này tớ muốn hỏi