Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
2/3:x=7/10 X x5/9=5/18
x=7/10:2/3 x=5/18:5/9
x=21/20 x=1/2
a) X x 5/8 = 1/3
X = 1/3 : 5/8
X = 1/3 x 8/5
X = 8/15
b) 12/11 x X = 4
X = 4 : 12/11
X = 4 x 11/12
X = 33
c) 5 x X = 7/9
X = 7/9 : 5
X = 7/9 x 5
X = 35/45
X = 7/9
Nếu mình có trả lời sai thì thông cảm cho mình vì mình cũng lớp 4 :)
a)\(x+\frac{15}{16}+\frac{7}{8}=\frac{15}{4}\)
\(x+\frac{29}{16}=\frac{15}{4}\)
\(x=\frac{15}{4}-\frac{29}{16}\)
\(x=\frac{31}{16}\)
b)\(x-\frac{27}{28}-\frac{9}{14}=\frac{13}{7}\)
\(x-\frac{45}{28}=\frac{13}{7}\)
\(x=\frac{13}{7}+\frac{45}{28}\)
\(x=\frac{97}{28}\)
c)\(x\times\frac{1}{5}+x+\frac{1}{6}=\frac{2}{3}\)
\(x\times\frac{1}{5}+x=\frac{2}{3}-\frac{1}{6}\)
\(x\times\left(\frac{1}{5}+1\right)=\frac{1}{2}\)
\(x\times\frac{6}{5}=\frac{1}{2}\)
\(x=\frac{1}{2}:\frac{6}{5}\)
\(x=\frac{5}{12}\)
d)\(x:14=\frac{1}{4}+\frac{2}{9}+\frac{3}{4}\)
\(x:14=\frac{11}{9}\)
\(x=\frac{11}{9}\times14\)
\(x=\frac{154}{9}\)
#H
\(A=\frac{1}{2}+\frac{1}{6}+\frac{1}{12}+\frac{1}{20}+\frac{1}{30}+\frac{1}{42}\)
= \(\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+\frac{1}{4.5}+\frac{1}{5.6}+\frac{1}{6.7}\)
= \(1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+\frac{1}{4}-\frac{1}{5}+\frac{1}{5}-\frac{1}{6}+\frac{1}{6}-\frac{1}{7}\)
= \(1-\frac{1}{7}\)
= \(\frac{7}{7}-\frac{1}{7}\)
= \(\frac{6}{7}\)
2) \(\frac{7}{4}-x.\frac{4}{3}=\frac{5}{19}\)
\(x.\frac{4}{3}=\frac{7}{4}-\frac{5}{19}\)
\(x.\frac{4}{3}=\frac{133}{76}-\frac{20}{76}\)
\(x.\frac{4}{3}=\frac{113}{76}\)
\(x=\frac{113}{76}:\frac{4}{3}\)
\(x=\frac{399}{304}\)
VẬY \(x=\frac{399}{304}\)
b) \(\left(x+\frac{3}{4}\right).\frac{5}{7}=\frac{10}{9}\)
\(\left(x+\frac{3}{4}\right)=\frac{10}{9}:\frac{5}{7}\)
\(x+\frac{3}{4}=\frac{14}{9}\)
\(x=\frac{14}{9}-\frac{3}{4}\)
\(x=\frac{29}{36}\)
Vậy \(x=\frac{29}{36}\)
c) \(x.\frac{1}{2}+\frac{3}{2}.x=\frac{4}{5}\)
\(x.\left(\frac{1}{2}+\frac{3}{2}\right)=\frac{4}{5}\)
\(x.2=\frac{4}{5}\)
\(x=\frac{4}{5}:2\)
\(x=\frac{2}{5}\)
Vậy \(x=\frac{2}{5}\)
Chúc bạn học tốt !!!
`a)4/5:3/x xx2/11=24/165`
`(4/5xx2/11)xx 3/x=8/55`
`8/55xx3/x=8/55`
`3/x=8/55:8/55`
`3/x=1`
`3:x=1`
`x=3:1`
`x=3`
____________________________________________
`b)4/3:x/5=5/13xx4/9`
`4/3:x/5=20/117`
`x/5=4/3:20/117`
`x/5=39/5`
`x=39`
A) 4/5:3/x X 2/11=24/165
\(\dfrac{4}{5}:\dfrac{3}{x}X\dfrac{2}{11}=\dfrac{24}{165}\)
\(\dfrac{3}{x}=\dfrac{24}{165}:\dfrac{4}{5}:\dfrac{2}{11}\)
\(\dfrac{3}{x}=1\)
\(\dfrac{3}{x}=\dfrac{3}{3}\)
=> x=3
B) \(\dfrac{4}{3}:\dfrac{x}{5}=\dfrac{5}{13}x\dfrac{4}{9}\)
\(\dfrac{4}{3}:\dfrac{x}{5}=\dfrac{20}{117}\)
\(\dfrac{x}{5}=\dfrac{4}{3}:\dfrac{20}{117}\)
\(\dfrac{x}{5}=\dfrac{39}{5}\)
=> x = 39
Bài 1:
\(\frac{11}{6}\)x \(x-\frac{1}{5}=2\) \(x:\frac{5}{7}\)x\(\frac{4}{9}=\frac{2}{3}\)
\(x:\frac{5}{7}=\frac{2}{3}:\frac{4}{9}=\frac{3}{2}\) \(x=\frac{3}{2}\)x \(\frac{5}{7}\)= \(\frac{15}{14}\)
\(\frac{11}{6}\)x \(x=2+\frac{1}{5}\)
\(\frac{11}{6}\)x \(x=\frac{11}{5}\)
\(x=\frac{11}{5}:\frac{11}{6}\)
\(x=\frac{6}{5}\)
Để 13b chia hết cho 5 thì b = 0 hoặc 5
Vì 13b chia hết cho 9 nên 1+ 3 + b chia hết cho 9
=> b = 5. Vậy số đó là: 135
Để a4b cùng chia hết cho 5 và 9 thì b = 0 hoặc 5 và a + 4 + b chia hết cho 9
* Nếu b = 0 thì a = 5 để chia hết cho cả 5 và 9
* Nếu b = 5 thì a = 0 hoặc b = 9 để chia hết cho cả 5 và 9
a) x + 4/7 = 2:2/5
x+ 4/7 = 1/5
x = 1/5 + 4/7
x= 2/7 ( đã rút gọn )
b) x - 1/8 = 1/4 * 1/2
x -1/8 = 1/8
x = 1/8 + 1/8
x = 2/8 ( đã rút gọn )
a x9+9118=18280
x9=18280-9118
x9=9162
x=9162chia 9
x=1018
b
* là nhân ak