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a) x= 1/4
b) x= -7/144
c) x= 25/6
d) x=17/7
e) x= 80/63
f) x= -45/14
Câu a:
4/9.x = 1/9
x = 1/9 : 4/9
x = 1/9 x 9/4
x = 1/4
vậy x = 1/4
Câu b:
x : -1/2 = 7/12
x = 7/12 x (-1/2)
x = - 7/24
Vậy x = - 7/24
Câu c:
-5/4 : x = -3/10
x = -5/4 : (-3/10)
x = -5/4 x (-10/3)
x = 25/6
Vậy x = 25/6
\(a.\)
\(\frac{4}{9}.x=\frac{1}{9}\)
\(\Rightarrow x=\frac{1}{9}:\frac{4}{9}\)
\(\Rightarrow x=\frac{1}{9}.\frac{9}{4}\)
\(\Rightarrow x=\frac{1}{4}\)
Vậy \(x=\frac{1}{4}\)
\(b.\)
\(\frac{7}{18}.x-\frac{2}{3}=\frac{5}{18}\)
\(\Rightarrow\frac{7}{18}.x=\frac{5}{18}+\frac{2}{3}\)
\(\Rightarrow\frac{7}{18}.x=\frac{5}{18}+\frac{12}{18}\)
\(\Rightarrow\frac{7}{18}.x=\frac{17}{18}\)
\(\Rightarrow x=\frac{17}{18}:\frac{7}{18}\)
\(\Rightarrow x=\frac{17}{18}.\frac{18}{7}\)
\(\Rightarrow x=\frac{17}{7}\)
Vậy \(x=\frac{17}{7}\)
\(c.\)
\(x:-\frac{1}{12}=\frac{7}{12}\)
\(\Rightarrow x=\frac{7}{12}.-\frac{1}{12}\)
\(\Rightarrow x=-\frac{7}{144}\)
Vậy \(x=-\frac{7}{144}\)
\(d.\)
\(\frac{4}{9}-\frac{7}{8}.x=-\frac{2}{3}\)
\(\Rightarrow\frac{7}{8}.x=\frac{4}{9}-\left(-\frac{2}{3}\right)\)
\(\Rightarrow\frac{7}{8}.x=\frac{4}{9}+\frac{2}{3}\)
\(\Rightarrow\frac{7}{8}.x=\frac{4}{9}+\frac{6}{9}\)
\(\Rightarrow\frac{7}{8}.x=\frac{10}{9}\)
\(\Rightarrow x=\frac{10}{9}:\frac{7}{8}\)
\(\Rightarrow x=\frac{10}{9}.\frac{8}{7}\)
\(\Rightarrow x=\frac{80}{63}\)
Vây \(x=\frac{80}{63}\)
\(e.\)
\(-\frac{5}{14}:x=-\frac{3}{10}\)
\(\Rightarrow x=-\frac{5}{14}:-\frac{3}{10}\)
\(\Rightarrow x=-\frac{5}{14}.-\frac{10}{3}\)
\(\Rightarrow x=\frac{5}{7}.\frac{5}{3}\)
\(\Rightarrow x=\frac{25}{21}\)
Vậy \(x=\frac{25}{21}\)
\(g.\)
\(\frac{1}{6}+\frac{-5}{7}:x=-\frac{7}{18}\)
\(\Rightarrow-\frac{5}{7}:x=-\frac{7}{18}-\frac{1}{6}\)
\(\Rightarrow-\frac{5}{7}:x=-\frac{7}{18}-\frac{3}{18}\)
\(\Rightarrow-\frac{5}{7}:x=-\frac{10}{18}\)
\(\Rightarrow-\frac{5}{7}:x=-\frac{5}{9}\)
\(\Rightarrow x=-\frac{5}{7}:-\frac{5}{9}\)
\(\Rightarrow x=-\frac{5}{7}.-\frac{9}{5}\)
\(\Rightarrow x=\frac{9}{7}\)
Vậy \(x=\frac{9}{7}\)
|Câu d:
x = 3/4 + 1/-12
x = 9/12 - 1/12
x = 8/12
x = 2/3
Vậy x = 2/3
Câu e:
x /14 = 1/7 + (-3)/14
x/14 = 1/7 - 3/14
x/14 = 2/14 - 3/14
x/14 = -1/14
x = - 1/14 x 14
x = -1
Vậy x = -1
Câu 1:
a; x/7 = - 9/14
x = - 9/14 x 7
x = - 9/2
Vậy x = -9/2
b; - 16/36 = - y/4
-4/9 = - y/4
y = -4/9 x (-4)
y = 16/9
Vậy y = 16/9
Câu 1c:
-5/12 = x/60
x = -5/12 x 60
x = - 25
Vậy x = - 25
d: -4/8 = x/-10 = -7/y
-4/8 = x/-10
x = -4/8 x (-10)
x = 5
-4/8 = -7/y
y = - 7 : (-4/8)
y = 7 x 8/4
y = 14
Vậy (x; y) = (5; 14)
-37 + 14 +26 + 37
=-37 + 37 + 14 + 36
=0 + 50
=50
-24 + 6 + 10 + 24
=(-24 + 24) +(6+10)
= 0+16
= 16
Bài 1:
1; ( - 35) : (-7) = 5
2; (- 42) : 21 = - 2
3; 45 : (-9) = -5
4; 18 : 9 = 2
5; (- 30) : (- 15) = 2
6; 0 : 18 = 0
7; 0 : (-13) = 0
8; 44 : (-4) = - 11
9; - 55 : 11 = - 5
10; 46 : 23 = 2
d) |2x – 5| –7 = 22
| 2x -5 | = 22+7
| 2x -5 | = 29
TH1: 2x-5 = -29
2x = -29+5
2x= -24
x= -24:2
x= -12
TH2: 2x -5 =29
2x = 29+5
2x= 34
x= 34:2
x= 17
Vậy...
nhiều quá :((
\(a,2\left(x-5\right)-3\left(x+7\right)=14\)
\(2x-10-3x-21=14\)
\(-x-31=14\)
\(-x=45\)
\(x=45\)
\(b,5\left(x-6\right)-2\left(x+3\right)=12\)
\(5x-30-2x-6=12\)
\(3x-36==12\)
\(3x=48\)
\(x=16\)
\(c,3\left(x-4\right)-\left(8-x\right)=12\)
\(3x-12-8+x=0\)
\(4x-20=0\)
\(4x=20\)
\(x=5\)
Cố nốt nha bn !
cảm ơn, bn nha:)))
mà hình như bạn TOP 3 trả lời câu hỏi pải ko nhỉ???
a.1/4
b.-7/144
c.25/21
d.17/7
e.80/63
f.9/7
a)1/4
b)-7/144
c)-25/21
d)17/7
e)16/63
f)9/7
a; \(\dfrac{4}{9}\)\(x=\dfrac{1}{9}\)
\(x=\dfrac{1}{9}:\dfrac{4}{9}\)
\(x=\dfrac{1}{4}\)
Vậy \(x=\dfrac{1}{4}\)
b; \(x\) : - \(\dfrac{1}{12}\) = \(\dfrac{7}{12}\)
\(x\) = \(\dfrac{7}{12}\) x (-\(\dfrac{1}{12}\))
\(x\) = - \(\dfrac{7}{144}\)
Vậy \(x=-\dfrac{7}{144}\)
c; - \(\dfrac{5}{14}:x\) = - \(\dfrac{3}{10}\)
\(x\) = - \(\dfrac{5}{14}\) : (-\(\dfrac{3}{10}\))
\(x\) = \(\dfrac{25}{21}\)
Vậy \(x=\dfrac{25}{21}\)
d; \(\dfrac{7}{18}\)\(x\) - \(\dfrac{2}{3}\) = \(\dfrac{5}{18}\)
\(\dfrac{7}{18}\)\(x\) = \(\dfrac{5}{18}\) + \(\dfrac{2}{3}\)
\(\dfrac{7}{18}x\) = \(\dfrac{17}{18}\)
\(x=\dfrac{17}{18}:\dfrac{7}{18}\)
\(x=\dfrac{17}{7}\)
Vậy \(x=\dfrac{17}{7}\)
\(\dfrac{4}{9}\) - \(\dfrac{7}{8}\)\(x\) = - \(\dfrac{2}{3}\)
\(\dfrac{7}{8}x\) = \(\dfrac{4}{9}\) + \(\dfrac{2}{3}\)
\(\dfrac{7}{8}x\) = \(\dfrac{10}{9}\)
\(x=\dfrac{10}{9}:\dfrac{7}{8}\)
\(x=\dfrac{80}{63}\)
Vậy \(x=\dfrac{80}{63}\)
f; \(\dfrac{1}{6}\) + (- \(\dfrac{5}{7}\)) : \(x=-\dfrac{7}{18}\)
\(\dfrac{5}{7}:x\) = \(\dfrac{1}{6}\) + \(\dfrac{7}{18}\)
\(\dfrac{5}{7}\) : \(x\) = \(\dfrac{5}{9}\)
\(x=\dfrac{5}{7}\) : \(\dfrac{5}{9}\)
\(x\) = \(\dfrac{9}{7}\)
Vậy \(x=\dfrac{9}{7}\)