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812 × X + 188 × X = 10000
X ( 812 + 188 ) = 10000
X . 1000 = 10000
X = 10000 : 1000
X = 10
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x + 200 = 600 + 100
x + 200 =700
x = 700 - 200
x=500
x - 600 = 400 + 600
x - 600 = 1000
x = 1000 + 600
x = 1600
k mk nha lan hương
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\(25-x+29-x+33-x+...+101-x=128\)
\(\left(25+29+33+...+101\right)-\left(x+x+x+...+x\right)=128\)
Tính tổng như thường:
\(1260+20x=128\)
\(20x=-1132\)
\(x=-56,6\)
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\(a,\Rightarrow9y+280=1225\\ \Rightarrow9y=945\\ \Rightarrow y=105\\ b,\Rightarrow y-798=188\\ \Rightarrow y=986\\ c,\Rightarrow y:5=628\\ \Rightarrow y=3140\)
a: \(9y+35\cdot8=1225\)
\(\Leftrightarrow9y=945\)
hay y=105
b: Ta có: \(y-378-420=188\)
\(\Leftrightarrow y=188+420+378\)
hay y=986
c: Ta có: \(954-\left(y:5\right)=326\)
\(\Leftrightarrow y:5=628\)
hay y=3140
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\(x.16,5+x.82,5+x=128\)
\(x\left(16,5+82,5+1\right)=128\)
\(x.100=128\)
\(\Leftrightarrow x=1,28\)
X x 16.5 + X x 82.5 + X = 128
X x( 16.5 + 82.5 +1 ) = 128
X x 100 = 128
X = 128 : 100
X = 1.28
Cách lm
600 : x + 128 = 188
x = 600 : 188
x = ?
x = ? - 128
x = ?