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a) x + 2/3=9/11
<=> x=9/11-2/3= 5/33
b) x - 3/10=4/15
<=> x=4/15+3/10=17/30
c) X x 1/7=5/6
<=> x=5/6:1/7=35/6
d) x : 3/5=1/6
<=> x=1/6x3/5=1/10
\(a,x+\frac{2}{3}=\frac{9}{11}\)
\(x=\frac{9}{11}-\frac{2}{3}\)
\(x=\frac{5}{33}\)
\(b,x-\frac{3}{10}=\frac{4}{15}\)
\(x=\frac{4}{15}+\frac{3}{10}\)
\(x=\frac{17}{30}\)
\(c,x\cdot\frac{1}{7}=\frac{5}{6}\)
\(x=\frac{5}{6}:\frac{1}{7}\)
\(x=\frac{35}{6}\)
\(d,x:\frac{3}{5}=\frac{1}{6}\)
\(x=\frac{1}{6}\cdot\frac{3}{5}\)
\(x=\frac{1}{10}\)
. là nhân nha
a. \(\frac{5}{12}:x=\left(\frac{5}{6}-\frac{1}{2}\right)\times\frac{5}{4}\)
\(=>\)\(\frac{5}{12}:x=\frac{1}{3}\times\frac{5}{4}=\frac{5}{12}\)
\(=>x=\frac{5}{12}:\frac{5}{12}=1\)
b.\(x:0,15=\left(2,8+0,38\right):0,75\)
\(=>x:0,15=3,18:0,75=4,24\)
\(=>x=4,24\times0,15=0,636\)
a) (x+1/7):1/3=3/4
=> x+1/7=3/4.1/3
=> x+1/7=1/4
=> x=1/4-1/7
=> x=3/28
b)(1/4+x) :5/7=4/9
(1/4+x) =4/9.5/7
(1/4+x)=20/63
x=20/63-1/4
x=17/252
các phần còn lại cậu tự làm nha giống nhau mà
Câu trả lời của bạn Thủy Thủ Mặt Trăng là đúng hay sai ạ
mn cho mik bt vs
mik cũng đang ko bt bài này
a) (x + 1,2) : 2,5 = 5
x + 1,2 = 5 . 2,5
x + 1,2 = 12,5
x = 12,5 - 1,2
x = 11,3
Vậy x = 11,3
\(b)4,25.x=53,38\)
\(x=53,38:4,25\)
\(x=12,56\)
Vậy x = 12,56
\(c)x.\frac{1}{2}+\frac{3}{4}=1\)
\(x.\frac{1}{2}=1-\frac{3}{4}\)
\(x.\frac{1}{2}=\frac{1}{4}\)
\(x=\frac{1}{4}:\frac{1}{2}\)
\(x=\frac{1}{2}\)
Vậy \(x=\frac{1}{2}\)
\(d)\frac{2}{7}+\frac{5}{7}:x=5-\frac{1}{7}\)
\(\frac{2}{7}+\frac{5}{7}:x=\frac{34}{7}\)
\(\frac{5}{7}:x=\frac{34}{7}-\frac{2}{7}\)
\(\frac{5}{7}:x=\frac{32}{7}\)
\(x=\frac{5}{7}:\frac{32}{7}\)
\(x=\frac{5}{32}\)
Vậy \(x=\frac{5}{32}\)
e) x - 2448 : 24 = 102
x - 102 = 102
x = 102 + 102
x = 204
Vậy x = 204
tính trừ bt nha bạn vế thương thì cũng tĩnh ra xong mới tính nha
a, \(x\) + \(\dfrac{1}{4}\) - \(\dfrac{3}{8}\) = \(\dfrac{7}{12}\)
\(x\) - \(\dfrac{1}{8}\) = \(\dfrac{7}{12}\)
\(x\) = \(\dfrac{7}{12}\) + \(\dfrac{1}{8}\)
\(x\) = \(\dfrac{17}{24}\)
1a)\(\dfrac{14}{3}-\dfrac{11}{4}+\dfrac{80}{11}\)
= \(\dfrac{23}{12}\) + \(\dfrac{80}{11}\)
= \(\dfrac{1213}{132}\)
b \(\dfrac{4}{5}\times\dfrac{15}{16}+\dfrac{5}{2}:\dfrac{20}{9}\)
= \(\dfrac{3}{4}+\dfrac{5}{2}\times\dfrac{9}{20}\)
= \(\dfrac{3}{4}+\dfrac{9}{8}\)
= \(\dfrac{15}{8}\)
b 204 x 307 - 148004 : 209
= 62628 - 708,15311
=61919,846889
Bài 2:
a, \(\dfrac{5}{23}\) \(\times\) \(\dfrac{17}{26}\) + \(\dfrac{5}{23}\) \(\times\) \(\dfrac{9}{26}\)
= \(\dfrac{5}{23}\) \(\times\) ( \(\dfrac{17}{26}\) + \(\dfrac{9}{26}\))
= \(\dfrac{5}{23}\) \(\times\) \(\dfrac{26}{26}\)
= \(\dfrac{5}{23}\)
b, \(\dfrac{3}{4}\) \(\times\) \(\dfrac{7}{9}\) + \(\dfrac{7}{4}\) \(\times\) \(\dfrac{3}{9}\)
= \(\dfrac{7}{12}\) + \(\dfrac{7}{12}\)
= \(\dfrac{14}{12}\)
= \(\dfrac{7}{6}\)
1. a) 1 gấp 100 lần 1/100
b) 1/10 gấp 10 lần 1/100
c) 1/100 gấp 10 lần 1/1000
2.
a) x + 2/5 = 1/2
x = 1/2 - 2/5
x = 1/10
b) x - 2/5 = 2/7
x = 2/7 + 2/5
x = 24/35
c) x * 3/4 = 9/20
x = 9/20 / 3/4
x = 3/5
d) x / 1/17 = 14
x = 14 * 1/17
x = 14/17
3. Trung bình mỗi giờ vỏi nước đó chảy vào được số phần của bể là : (2/15 + 1/5) /2 = 1/6
4. trước đây mua 1m vải phải trả số tiền là: 60000/5 = 12000(đồng)
hiện nay với 60000 đồng thì mua được số mét vải là: 60000/(12000-2000)=6(m)
Đáp số: 6m vải
\(a,x+\dfrac{2}{5}=\dfrac{1}{2}\)
\(x=\dfrac{1}{2}-\dfrac{2}{5}\)
\(x=\dfrac{5}{10}-\dfrac{4}{10}\)
\(\Rightarrow x=....\)
\(a,x+\dfrac{2}{5}=\dfrac{1}{2}\\ \Rightarrow x=\dfrac{1}{2}-\dfrac{2}{5}=\dfrac{5-4}{10}=\dfrac{1}{10}\)
\(b,x-\dfrac{2}{5}=\dfrac{1}{7}\\ \Rightarrow x=\dfrac{1}{7}+\dfrac{2}{5}=\dfrac{5+14}{35}=\dfrac{19}{35}\)
\(c,x\cdot\dfrac{3}{4}=\dfrac{9}{20}\\ \Rightarrow x=\dfrac{9}{20}:\dfrac{3}{4}=\dfrac{9}{20}\cdot\dfrac{4}{3}=\dfrac{3\cdot1}{5\cdot1}=\dfrac{3}{5}\)
\(d,x:\dfrac{1}{7}=14\\ \Rightarrow x=14\cdot\dfrac{1}{7}=\dfrac{14}{7}=2\)
\(e,\dfrac{2}{3}-x=\dfrac{1}{5}\\ \Rightarrow x=\dfrac{2}{3}-\dfrac{1}{5}=\dfrac{10-3}{15}=\dfrac{7}{15}\)
\(f,\dfrac{4}{15}:x=\dfrac{12}{25}\\ \Rightarrow x=\dfrac{4}{15}:\dfrac{12}{25}=\dfrac{4}{15}\cdot\dfrac{25}{12}=\dfrac{1\cdot5}{3\cdot3}=\dfrac{5}{9}\)
a, \(x+\dfrac{2}{5}=\dfrac{1}{2}\\ \Rightarrow x=\dfrac{1}{2}-\dfrac{2}{5}\\ \Rightarrow x=\dfrac{5}{10}-\dfrac{4}{10}\\ \Rightarrow x=\dfrac{1}{10}\)
b) \(x-\dfrac{2}{5}=\dfrac{1}{7}\\ \Rightarrow x=\dfrac{1}{7}+\dfrac{2}{5}\\ \Rightarrow x=\dfrac{5}{35}+\dfrac{14}{35}\\ \Rightarrow x=\dfrac{19}{35}\)
c) \(x\times\dfrac{3}{4}=\dfrac{9}{20}\\ \Rightarrow x=\dfrac{9}{20}:\dfrac{3}{4}\\ \Rightarrow x=\dfrac{9}{20}\times\dfrac{4}{3}\\ \Rightarrow x=\dfrac{36}{60}\\ \Rightarrow x=\dfrac{3}{5}\)
a. x + \(\dfrac{2}{5}\) = \(\dfrac{1}{2}\)
\(\Leftrightarrow\dfrac{10x}{10}+\dfrac{4}{10}=\dfrac{5}{10}\)
<=> 10x + 4 = 5
<=> 10x = 1
<=> x = \(\dfrac{1}{10}\)
b. \(x-\dfrac{2}{5}=\dfrac{1}{7}\)
\(\Leftrightarrow\dfrac{35x}{35}-\dfrac{14}{35}=\dfrac{5}{35}\)
<=> 35x - 14 = 5
<=> 35x = 19
<=> x = \(\dfrac{19}{35}\)
c. \(x.\dfrac{3}{4}=\dfrac{9}{20}\)
\(\Leftrightarrow\dfrac{15x}{20}=\dfrac{9}{20}\)
<=> 15x = 9
<=> x = \(\dfrac{9}{15}\)
d. \(x:\dfrac{1}{7}=14\)
\(\Leftrightarrow\dfrac{1}{7x}=14\)
ĐKXĐ: x\(\ne\)0
<=> 14 . 7x = 1
<=> 98x = 1
<=> x = \(\dfrac{1}{98}\)(thỏa mãn)
e. \(\dfrac{2}{3}-x=\dfrac{1}{5}\)
\(\Leftrightarrow\dfrac{10}{15}-\dfrac{15x}{15}=\dfrac{3}{15}\)
<=> 10 - 15x = 3
<=> 10 - 3 = 15x
<=> 15x = 7
<=> x = \(\dfrac{7}{15}\)
f. \(\dfrac{4}{15}:x=\dfrac{12}{25}\)
\(\Leftrightarrow\dfrac{4}{15x}=\dfrac{12}{25}\)
ĐKXĐ: x \(\ne\) 0
<=> 14 . 25 = 12 . 15x
<=> 100 = 180x
<=> x = \(\dfrac{100}{180}=\dfrac{5}{9}\)
a, x + 2/5 = 1/2
\(x+\dfrac{4}{10}=\dfrac{5}{10 }\)
\(x=\dfrac{5}{10}-\dfrac{4}{10}\)
x=1/10
b, x - 2/5 = 1/7
\(x-\dfrac{14}{35}=\dfrac{5}{35}\)
\(x=\dfrac{5}{35}+\dfrac{14}{35}\)
x=19/35
c,x * 3/4 = 9/20
\(x.\dfrac{15}{20}=\dfrac{9}{20}\)
\(x=\dfrac{9}{20}:\dfrac{15}{20}\)
x=5/3
d, x : 1/7 = 14
\(x:\dfrac{2}{14}=14\)
\(x=14.\dfrac{2}{14}\)
x=2
e, 2/3 - x = 1/5
\(\dfrac{10}{15}-x=\dfrac{3}{15}\)
\(x=\dfrac{10}{15}-\dfrac{3}{15}\)
x=7/15
f, 4/15 : x = 12/25
\(\dfrac{20}{75}:x=\dfrac{36}{75}\)
\(x=\dfrac{20}{75}:\dfrac{36}{75}\)
x=5/9
a: Ta có: \(x+\dfrac{2}{5}=\dfrac{1}{2}\)
\(\Leftrightarrow x=\dfrac{1}{2}-\dfrac{2}{5}=\dfrac{5}{10}-\dfrac{4}{10}=\dfrac{1}{10}\)
b: Ta có: \(x-\dfrac{2}{5}=\dfrac{1}{7}\)
\(\Leftrightarrow x=\dfrac{1}{7}+\dfrac{2}{5}=\dfrac{5}{35}+\dfrac{14}{35}=\dfrac{19}{35}\)
c: Ta có: \(x\cdot\dfrac{3}{4}=\dfrac{9}{20}\)
\(\Leftrightarrow x=\dfrac{9}{20}:\dfrac{3}{4}=\dfrac{9}{20}\cdot\dfrac{4}{3}=\dfrac{3}{5}\)
d: Ta có: \(x:\dfrac{1}{7}=14\)
\(\Leftrightarrow x=14\cdot\dfrac{1}{7}=2\)