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1/3x + 3/4x - 75% = -5 1/4
=> x - 3/4 = -21/4
=> x = -21/4 + 3/4
=> x = -9/2
60%x + 5/6x = -76
=> 3/5x + 5/6x = -76
=> 43/30x = -76
=> x = -76 : 43/30
=> x = -2280/43
\(\frac{1}{3}x+\frac{3}{4}x-75\%=-5\frac{1}{4}\)
\(\frac{13}{12}x-\frac{3}{4}=-\frac{21}{4}\)
\(\frac{13}{12}x=-\frac{9}{2}\)
\(x=-\frac{54}{13}\)
\(60\%.x+\frac{2}{3}x=-76\)
\(\frac{3}{5}x+\frac{2}{3}x=-76\)
\(\frac{19}{15}x=-76\)
\(x=-60\)
a)
\(25+|x-1|=\left(-15\right)+76\)
\(\Rightarrow25+|x-1|=61\)
\(\Rightarrow|x-1|=61-25\)
\(\Rightarrow|x-1|=36\)
\(\Rightarrow\orbr{\begin{cases}x-1=36\\x-1=-36\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=36+1\\x=-36+1\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=37\\x=-35\end{cases}}\)
Vậy \(x=37\) hoặc \(x=-35\)
a, 25 + / x - 1 / = ( - 15 ) + 76
25 + / x - 1 / = 61
/ x - 1 / = 61 - 25
Tự tính nốt
a)437+(248-x)=635
248-x=635-437=198
x=248-198=50
b)5.(x+27)=465
x+27=465/5=93
x=93-27=66
c)3.(x+3)=30
x+3=30:3=10
x=10-3=7
d)8x-9=31
8x=31-9=22
x=22/8=11/4
e)7x-9=26
7x=26+9=35
x=35:7=5
g)76-3.(x+5)=16
3.(x+5)=76-16=60
x+5=60/3=20
x=15
60%x+2\3x=684
60\100x+2\3x=684
3\5x+2\3x=684
(3\5+2\3)x=684
(9\15+10\15)x=684
19\15x=684
x=684:19\15
x=540
to chac chan voi dap an nay cho yo 1 dung nha
a) x + 13 = 32 - 76
=> x + 13 = -44
=> x = (-44) - 13
=> x = -57
b) ( -15) + x = ( -14 ) - ( -57 )
=> (-15) + x = (-14) + 57
=> (-15) + x = 43
=> x = 43 - (-15)
=> x = 43 + 15
=> x = 58
Tìm x
a) x+13=32-76
x+13= -44
x= -44-13
x= -57
b) (-15)+x=(-14)-(-57)
(-15)+x= (-14)+57
(-15)+x= 43
x= 43-(-15)
x=43+15
x=58
1: \(\Leftrightarrow x+60\inƯC\left(480;600\right)\)
\(\Leftrightarrow x+60\inƯ\left(120\right)\)
mà x là số tự nhiên
nên \(x+60\in\left\{60;120\right\}\)
hay \(x\in\left\{0;60\right\}\)
a) \(3,5x-25=60.\frac{3}{4}\Leftrightarrow3,5x-25=45\)
\(\Leftrightarrow3,5x=45+25\Leftrightarrow3,5x=70\Leftrightarrow x=\frac{70}{3,5}=20\)
b) \(-1\frac{1}{2}x+\frac{1}{5}=2\frac{3}{10}\Leftrightarrow\frac{-3}{2}x=\frac{23}{10}\Leftrightarrow x=\frac{23}{10}:\frac{-3}{2}=\frac{-23}{15}\)
a)\(3,5x-25=60:\frac{3}{4}=80\)
\(3,5x=80+25\)
\(3,5x=105\)
\(x=105:3,5\)
\(x=30\)
b) \(\frac{-3}{2}x+\frac{1}{5}=\frac{23}{10}\)
\(\frac{-3}{2}x=\frac{23}{10}-\frac{1}{5}=\frac{21}{10}\)
\(x=\frac{21}{10}:\frac{-3}{2}\)
\(x=\frac{-7}{5}\)
Ta có :
\(\frac{2}{3}\)là phân số tối giản
nên \(\frac{-x}{6}=\frac{2}{3}\)
\(\Rightarrow\text{-x.3=2.6}\)
\(\Rightarrow-x.3=12\)
\(\Rightarrow x=-4\)
Tương tự \(\frac{14}{-y}=\frac{2}{3}\)
\(14.3=2.y\)
\(\Leftrightarrow42=2y\)
\(\Rightarrow y=21\)
Và \(\frac{z}{60}=\frac{2}{3}\)
\(\Leftrightarrow3z=2.60\)
\(\Leftrightarrow3z=120\)
\(\Rightarrow z=40\)
Vậy x=-4
y=21
z=40
chúc bạn học tốt !
\(\frac{-x}{6}=\frac{14}{-y}=\frac{z}{60}=\frac{2}{3}\)
Xét \(\frac{-x}{6}=\frac{2}{3}\)
\(\Leftrightarrow-x.3=12\Leftrightarrow-x=4\Leftrightarrow x=-4\)
Xét \(\frac{14}{-y}=\frac{2}{3}\)
\(\Leftrightarrow14.3=-y.2\Leftrightarrow42=-y.2\Leftrightarrow y=-21\)
Xét \(\frac{z}{60}=\frac{2}{3}\)
\(\Leftrightarrow z.3=120\Leftrightarrow z=40\)
a) (5x - 1) : 3 + 1 = 4
=> (5x - 1) : 3 = 3
=> (5x - 1) = 9
=> 5x - 1 = 9
=> 5x = 10
=> x = 2
b) 54 : (16 - x) - 1=5
=> 54:(16-x) = 6
=> 16-x = 9
=> x = 7
