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10 x 9 = 90
20 x 0,25 = 5
10 x 10 = 100
ko mình minh ko lại
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10 x 10 = 100
20 x 20 = 400
30 x 30 = 900
nha bn chúc bn học giỏi
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1x1=1
10x10=100
100x100=10000
2x2=4
20x20=400
200x200=40000
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a, \(3.\left(10.x\right)=111\Leftrightarrow\left(10.x\right)=111:3\)
\(\Leftrightarrow10.x=37\Leftrightarrow x=37:10\Leftrightarrow x=3,7\)
b,\(3.\left(10+x\right)=111\Leftrightarrow\left(10+x\right)=111:3\)
\(\Leftrightarrow10+x=37\Leftrightarrow x=37-10\Leftrightarrow x=27\)
c,\(3+\left(10.x\right)=111\Leftrightarrow\left(10.x\right)=111-3\)
\(\Leftrightarrow10.x=108\Leftrightarrow x=108:10\Leftrightarrow x=10,8\)
d,\(3+\left(10+x\right)=111\Leftrightarrow\left(10+x\right)=111-3\)
\(\Leftrightarrow10+x=108\Leftrightarrow x=108-10\Leftrightarrow x=98\)
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2013*x +x* 1/2013 = 1/2013 + 2013
x* (2013+1/2013)=1/2013+2013
x = 1
x+10=1000
x=1000-10
x=990
x + 10 = 1000
x = 1000 - 10
x = 990