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a)15/8+3/4-5/12
=45+18-10/24
=53/24
b)11/24.12/33+5/6
=11.12/12.2.11.3+5/6
=1/6+5/6
=6/6=1
c)15/8+7/24:5/8
=15/8+7/24.8/5
=15/8+7.8/3.8.5
=15/8+7/15
=đề sai, nếu đúng thì như này
=8/15+7/15
=15/15=1
a) ( 2x - 5 ) - 3 = 2
2x - 5 = 2 + 3
2x - 5 = 5
2x = 5 + 5
2x = 10
x = 10 : 2
x = 5
Vậy x = 5
a,(2.x-5)-3=2
<=> 2x-5-3=2
<=> 2x-5-3-2=0
<=> 2x-10=0
<=> 2(x-5)=0
<=> x-5=0
<=> x=5
Đs: x=5
b,(3.x+1)+(x+1)=4
<=> 3x+1+x+1=4
<=> 3x+1+x+1-4=0
<=> 4x-2=0
<=> 2(x-1)=0
<=> x-1=0
<=> x=1
Đs:x=1
c,-12.(x-5)+7(3-x)=15
<=> -12x+60+21-3x=15
<=> -12x+60+21-7x-15=0
<=> -19x+66=0
<=> -19x+66=0
<=> -19x=-66
<=> x=66/19
Đs: 66/19
tìm x biết:
1/3+2/5.(x-1) = 4
=> 2/5.(x-1) = 4 - 1/3 = 11/3
=> x-1 = 11/3 : 2/5 = 55/6
=> x= 55/6 + 1 = 61/6
1/2-1/3:3x0 = -5
?????? đề hay thật
1. a, => -12x+60+21-7x = 5
=> 81 - 19x = 5
=> 19x = 81 - 5 = 76
=> x = 76 : 19 = 4
Tk mk nha
( 2 x y + 2/15 ) x 3 = 4/5
( 2 x y + 2/15 ) = 4/5 : 3
( 2 x y + 2/15 ) = 4/15
2 x y = 4/15 - 2/15
2 x y = 2/15
y = 2/15 :2
y = 1/15
(2 x y + 2/15) x 3 = 4/5
2 x y + 2/15) = 4/5 : 3
2 x y + 2/15 = 4/15
2 x y = 4/15 - 2/15
2 x y = 2/15
y = 2/15 : 2
y = 1/15
7/9 x (2 - 1/3 x y) = 14/15
(2 - 1/3 x y) = 14/15 : 7/9
(2 - 1/3 x y) = 6/5
2 - y = 6/5 x 1/3
2 - y = 2/5
y = 2/5 + 2
y = 12/5
4/21 + 5 x y - 8/7 = 1/3
4/21 + 5 x y = 1/3 + 8/7
4/21 + 5 x y = 31/21
5 x y = 31/21 - 4/21
5 x y = 9/7
y = 9/7 : 5
y = 9/35
7/12 x y - 3/12 x y = 5
y x (7/12 - 3/12) = 5
y x 1/3 = 5
y = 5 : 1/3
y = 15
\(a,0.25x\) - \(\frac{2}{3}x\) =\(1\frac{1}{6}\)
\(\Rightarrow x\cdot\left(0.25-\frac{2}{3}\right)=1\frac{1}{6}\)
\(\Rightarrow x\cdot\frac{-5}{12}=\frac{7}{6}\)
\(\Rightarrow x=\frac{7}{6}:\frac{-5}{12}\)
\(\Rightarrow x=\frac{-14}{5}=-2.8\)
\(-\frac{15}{12}+x+\frac{3}{7}=\frac{6}{5}x-\frac{1}{2}\)
<=>\(x-\frac{6}{5}x=-\frac{1}{2}+\frac{15}{12}-\frac{3}{7}\)
<=>\(-\frac{1}{5}x=\frac{9}{28}\)
<=>\(x=\frac{9}{28}:\left(-\frac{1}{5}\right)\)
<=>\(x=-\frac{45}{28}\)