2 (x-172)-111=155
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\(\Rightarrow2\left(x-172\right)=156+111\\ \Rightarrow2\left(x-172\right)=267\\ \Rightarrow x-172=\dfrac{267}{2}\\ \Rightarrow x=\dfrac{267}{2}+172\\ \Rightarrow x=\dfrac{267+2\times172}{2}\\ \Rightarrow\dfrac{267+344}{2}=\dfrac{611}{2}\)
\(2\left(x-172\right)-111=156\)
\(\Rightarrow2\left(x-172\right)=156+111\)
\(\Rightarrow2\left(x-172\right)=267\)
\(\Rightarrow x-172=\dfrac{267}{2}\)
\(\Rightarrow x=\dfrac{267}{2}+172\)
\(\Rightarrow x=\dfrac{267}{2}+\dfrac{172\cdot2}{2}\)
\(\Rightarrow x=\dfrac{267}{2}+\dfrac{344}{2}\)
\(\Rightarrow x=\dfrac{611}{2}\)
\(37\times46+37\times51+111\)
\(=37\times46+37\times51+37\times3\)
\(=37\times\left(46+51+3\right)\)
\(=37\times100\)
\(=3700\)
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\(172\times47+86\times8-34\times4\)
\(=172\times47+172\times4-34\times4\)
\(=172\times\left(47+4\right)-34\times4\)
\(=172\times51-34\times4\)
\(=172\times3\times17-17\times2\times4\)
\(=17\times\left(172\times3-2\times4\right)\)
\(=17\times\left(516-8\right)\)
\(=17\times508\)
\(=8636\)
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\(35\times215-35\times200-175\)
\(=35\times215-35\times200-35\times5\)
\(=35\times\left(215-200-5\right)\)
\(=35\times10\)
\(=350\)
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\(48\times56+28\times104\)
\(=48\times2\times28+28\times104\)
\(=28\times\left(48\times2+104\right)\)
\(=28\times200\)
\(=5600\)
a) \(37\times46+37\times51+111\)
\(=37\times46+37\times51+37\times3\)
\(=37\times\left(46+51+3\right)\)
\(=37\times100\)
\(=3700\)
b) \(35\times215-35\times210-175\)
\(=35\times215-35\times210-35\times5\)
\(=35\times\left(215-210-5\right)\)
\(=35\times0\)
\(=0\)
c) \(172\times47+86\times8-34\times4\)
\(=4\times\left(43\times47+86\times2-34\right)\)
\(=4\times\left(2021+172-34\right)\)
\(=4\times2159\)
\(=8636\)
d) \(48\times56+28\times104\)
\(=48\times56+56\times52\)
\(=56\times\left(48+52\right)\)
\(=56\times100\)
\(=5600\)
Tìm X biết: 2 x 172 x X x 252 = 172 x 2 x 252 x 5
X=5
a, x= 155 -51 <=> x=104
b.x=-120 : -24 <=> x=5
c.2(81-x)= 155 -35
<=> 2(81-x)=120
<=> 81 - x = 60
<=> x= 21
Lời giải:
a.
$155-x=51$
$x=155-51=104$
b.
$(-24)x=-120$
$x=(-120):(-24)=5$
c.
$35+2(81-x)=155$
$2(81-x)=155-35=120$
$81-x=120:2=60$
$x=81-60=21$
\(2\left(x-172\right)-111=155\)
\(\Rightarrow2\left(x-172\right)=155+111\)
\(\Rightarrow2\left(x-172\right)=266\)
\(\Rightarrow x-172=266:2\)
\(\Rightarrow x-172=133\)
\(\Rightarrow x=133+172\)
\(\Rightarrow x=205\)