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a: =152,3+7,7+2021,19-2021,19
=160
b: =7/15*3/14*20/13
\(=\dfrac{7}{14}\cdot\dfrac{3}{15}\cdot\dfrac{20}{13}=\dfrac{1}{2}\cdot\dfrac{1}{5}\cdot\dfrac{20}{13}=\dfrac{2}{13}\)
c: \(=\dfrac{7}{4}\left(\dfrac{13}{12}-\dfrac{10}{12}\right)+\dfrac{5}{6}=\dfrac{7}{16}+\dfrac{5}{6}=\dfrac{61}{48}\)
1)x+y=10& x=y
2)2x+3y=180
3)x+y=180
4)3x+5y=13 & y=2x
5)x+y=90 &x=2y
6)x-y=-9
7)y-z=10
( 3x/7 + 1 ) : (-4 ) = -1/28
3x/7 + 1 = -1/28 x (-4 )
(3x/7 + 1 = 1/7
3x/7 = 1/7 - 1
3x/7 = -6/7
Suy ra 3x = -6
x = -6 : 3
x = -2
1)\(25x+3\left(4-6x\right)=50\)
\(25x+12-18x=50\)
\(7x+12=50\)
\(7x=38\)
\(x=\frac{38}{7}\)
2)\(4\left(2x+3\right)+2\left(3x+1\right)=120\)
\(8x+12+6x+2=120\)
\(14x+14=120\)
\(14x=106\)
\(x=\frac{53}{7}\)
a) 1/2x - 2/3x = 7/12
-1/6x = 7/12
x = \(\frac{7}{12}\div\frac{-1}{6}\)
x = -7/2
b) x: 12 = -2,5
x = -2,5*12
x = -30
c) 11/2x = 13/15
x = 13/15:11/2
x = 26/165
d) 3x/7 + 1 = (-1/28)*(-4)
3x/7 + 1 = 1/7
3x/7 = 1/7 - 1
3x/7 = -6/7
3x = -6
x= -6/3
x= -2
a) x(0.5 - 2/3 ) = 7/12
(-1/6)x = 7/12
x = 7/12 : (-1/6)
x =-7/2
b) x : 12 = -2,5
x= -2.5 * 12 =-30
c) x = 13/15 : 5,5
x =26/125
d) 3x/7 + 1 = -1/28 * (-4)
3x/7 + 1 =1/7
3x/7 = 1/7 -1
3x/7 =-6/7
3x =-6/7 * 7
3x = -6
x =-2
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a) \(0,5x-\frac{2}{3}x=\frac{7}{12}\)
\(\frac{1}{2}x-\frac{2}{3}x=\frac{7}{12}\)
\(\Rightarrow x\left(\frac{1}{2}-\frac{2}{3}\right)=\frac{7}{12}\)
\(x.\frac{-1}{6}=\frac{7}{12}\)
\(x=\frac{7}{12}:\frac{-1}{6}\)
\(x=\frac{-7}{2}\)
b) \(x:4\frac{1}{3}=-2,5\)
\(x:\frac{13}{3}=\frac{-5}{2}\)
\(x=\frac{-5}{2}.\frac{13}{3}\)
\(x=\frac{-65}{6}\)
c) \(5,5x=\frac{13}{15}=\frac{11}{2}x=\frac{13}{5}\)
\(x=\frac{13}{5}:\frac{11}{2}\)
\(x=\frac{26}{55}\)
d) \(\left(\frac{3x}{7}+1\right):\left(-4\right)=\frac{-1}{28}\)
\(\frac{3x}{7}+1=\frac{-1}{28}.\left(-4\right)\)
\(\frac{3x}{7}+1=\frac{1}{7}\)
\(\frac{3x}{7}=\frac{1}{7}-1\)
\(\frac{3x}{7}=\frac{-6}{7}\)
\(\frac{3x}{7}=\frac{-6}{7}\Rightarrow\frac{3.\left(-2\right)}{7}=\frac{-6}{7}\)
Vậy x = -2
\(0,5x-\frac{2}{3}x=\frac{7}{12}\)\(\)
\(\frac{1}{2}x-\frac{2}{3}x=\frac{7}{12}\)
\(x.\left(\frac{1}{2}-\frac{2}{3}\right)=\frac{7}{12}\)