tìm x : x:123=12
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123-x=123.(12-1)
123-x=123.11
123-x=1353
x=1353:123
x=11
vậy x=11
Bài làm
123 - x = 123 . ( 12 - 1 )
123 - x = 123 . 11
123 - x = 1353
x = 123 - 1353
x = -1230
Vậy x = -1230
# Học tốt #
\(a,123\times54+27\times123-12\times123+123\times31\)
\(=123\times\left(54+27-12+31\right)\)
\(=123\times100\)
\(=12300\)
\(b,\dfrac{121}{27}\times\dfrac{54}{11}< n< \dfrac{100}{21}:\dfrac{25}{126}\)
\(22< n< \dfrac{100}{21}\times\dfrac{126}{25}\)
\(22< n< 24\)
Vì \(23>22\) và \(23< 24\) nên \(n=23\)
a123x54+27x123-12x123+123x31
=123:54+27:123-12:123+123:31
=6642+27:123-12:123+123:31
=6642+3321-12:123+123:31
=6642+3321-1476+123:31
=6642+3321-1476+3813
=12300
b,121/27x54/11<n>100/21:25/126
=22<n>24
n=23
\(a,123:x+12:x=4,5\\ \Rightarrow\left(123+12\right):x=4,5\\ \Rightarrow135:x=4,5\\ \Rightarrow x=30\\ b,89:x-5,15:x=62,5\\ \Rightarrow\left(89-5,15\right):x=62,5\\ \Rightarrow83,85:x=62,5\\ \Rightarrow x=1,3416\)
a) x-12=-15
x=-15+12
x=-3
b) 123-5(x+4)=38
5(x+4)=123-38
5(x+4)=85
x+4=85:5=17
x=17-4
x=13
\(a.x-12=-15\) \(b.123-5.\left(x+4\right)=38\)
\(x=\left(-15\right)+12\) \(5.\left(x+4\right)=123-38\)
\(x=-3\) \(5.\left(x+4\right)=85\)
\(x+4=85:5=17\)
\(x=17-4=13\)
b)\(7\times x-3\times x=123\)
\(x\times\left(7-3\right)=123\)
\(x\times4=123\)
\(x=123\div4\)
\(x=30,75\)
|x+23|^2002|+|y-12|^123=0
<=>|x+23|^2002\(\ge\) 0
\(\left|y-12\right|^{^{123}}\ge0\)
=>\(\left|x+23\right|^{2002}+\left|y-12\right|^{123}\ge0\)
=>x+23=0=>x=-23
=>y-12=0=>y=12
\(\left|x+23\right|^{2002}+\left|y-12\right|^{123}=0\)
\(\Rightarrow\hept{\begin{cases}\left|x+23\right|^{2002}=0\\\left|y-12\right|^{123}=0\end{cases}}\Rightarrow\hept{\begin{cases}x+23=0\\y-12=0\end{cases}}\Rightarrow\hept{\begin{cases}x=-23\\y=12\end{cases}}\)
Vậy \(x=-23;y=12\)
a) \(5\times x-123=12\)
\(\Rightarrow5\times x=135\)
\(\Rightarrow x=27\)
b) \(x+3x+5x+7x=96\)
\(\Rightarrow16x=96\)
\(\Rightarrow x=6\)
a) \(5\times x-123=12\)
\(5x=12+123\)
\(5x=135\)
\(x=135:5\)
\(x=27\)
________
b) \(x+3x+5x+7x=96\)
\(x\left(1+3+5+7\right)=96\)
\(x.16=96\)
\(x=96:16\)
\(x=6\)
x*123=12
x = 12:123
x = 4/41
tk mk nha
\(x\times123=12\)
\(x=12\div123\)
\(x=\frac{4}{41}\)