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a: -3/4=-9/12
-5/6=-10/12
mà -9>-10
nên -3/4>-5/6
b: -5/17<0<2/7
c: 11/10>1>9/14
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a) \(\frac{x}{6}=\frac{5}{24}\Rightarrow x=\frac{5}{24}.6=\frac{5}{4}\)
b) \(-\frac{4}{y}=\frac{20}{14}\Rightarrow y=-4:\frac{20}{14}=-\frac{14}{5}\)
c) \(\frac{4}{7}=\frac{12}{x}\Rightarrow x=12:\frac{4}{7}=21\)
d) \(\frac{3}{7}=\frac{y}{21}\Rightarrow y=\frac{3}{7}.21=9\)
a)
x= 43
b) 2X-12=8
2X =8+12
2X=20
X=20:2
x =10
c)45:(3X-17)=32
45 : (3X-17)=9
3X-17=45:9
3X-17=5
3X=5+17
3X=22
x=22:3
x= 7,33
d)(2X-8)x2=24
( 2X-8)x2 =16
2X-8 =16:2
2X-8 =8
2X =8+8
2X =16
x =16:2
X =8
Đúng thì tk nếu sai thì thôi
Làm ẩu ^^
đây bạn
a; - \(\dfrac{10}{13}\) + \(\dfrac{5}{17}\) - \(\dfrac{3}{13}\) + \(\dfrac{12}{17}\) - \(\dfrac{11}{20}\)
= - (\(\dfrac{10}{13}\) + \(\dfrac{3}{13}\)) + (\(\dfrac{5}{17}\) + \(\dfrac{12}{17}\)) - \(\dfrac{11}{20}\)
= - 1 + 1 - \(\dfrac{11}{20}\)
= 0 - \(\dfrac{11}{20}\)
= - \(\dfrac{11}{20}\)
b; \(\dfrac{3}{4}\) + \(\dfrac{-5}{6}\) - \(\dfrac{11}{-12}\)
= \(\dfrac{9}{12}\) - \(\dfrac{10}{12}\) + \(\dfrac{11}{12}\)
= \(\dfrac{10}{12}\)
= \(\dfrac{5}{6}\)
c; [13.\(\dfrac{4}{9}\) + 2.\(\dfrac{1}{9}\)] - 3.\(\dfrac{4}{9}\)
= [\(\dfrac{52}{9}\) + \(\dfrac{2}{9}\)] - \(\dfrac{4}{3}\)
= \(\dfrac{54}{9}\) - \(\dfrac{4}{3}\)
= \(\dfrac{14}{3}\)
đây là cách giải của mk:
a, 5(x + 35) = 515
=> x + 35 = 515 : 5
=> x + 35 = 103
=> x = 103 - 35
=> x = 68
b, 12x - 33 = 32 . 33
=> 12x - 33 = 32 + 3
=> 12x - 33 = 35
=> 12x - 33 = 243
=> 12x = 243 + 33
=> 12x = 276
=> x = 276 : 12
=> x = 23
c, 6 . x - 5 = 9
=> 6 . x = 9 + 5
=> 6 . x = 14
=> x = 14 : 6
=> x = \(\frac{2}{3}\)
d, 4(x - 12) + 9 = 17
=> 4(x - 12) = 17 - 9
=> 4(x - 12) = 8
=> 4 . x - 12 = 8
=> 4 . x = 8 + 12
=> 4 . x = 20
=> x = 20 : 4
=> x = 5
a, 5 ( x + 35 ) = 515
x + 35 = 515 : 5
x + 35 = 103
x = 103 - 35
x = 68
b, 12x - 33 = 32 . 33
12x - 33 = 35
12x - 33 = 243
12x = 243 + 33
12x = 276
x = 276 : 12
x = 23
c, 6.x - 5 = 9
6x = 9 + 5
6x = 14
x = 14 : 6
x = \(\frac{7}{3}\)
d, 4.( x - 12 ) + 9 = 17
4 . ( x - 12 ) = 17 - 9
4 . ( x - 12 ) = 8
x - 12 = 8 : 4
x - 12 = 2
x = 2 + 12
x = 14
12/-6 = -2
a/5 = -2 => a = -2.5 = -10
-b/3 = -2 => b/3 = 2 => b = 2.3 = 6
c/-17 = -2 => c = (-2).(-17) = 34
-d/-9 = d/9 = -2 => d = -2.9 = -18