X + 33 . X - 33 + 3 . ( 2x + 3 ) = x + 99
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a) \(33\times4+5\times33+33\times3+33-99=33\times4+5\times33+33\times3+33\times1-33\times3\)
\(=33\times\left(4+5+3+1-3\right)=33\times10=330\)
b) \(256+347+453-147-56-253=\left(256-56\right)+\left(347-147\right)+\left(453-253\right)\)
\(=200+200+200=600\)
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x+2x-33=99
<=>3x=99-33
<=>3x=66
<=>x=66:3
<=>x=22
vậy x=22
k mk 3 k mk k lại cho nha
^^ ^^ ^^
^^ ^^ ^^ ^^ ^^ ^^
x + 2x - 33 = 99
=> 3x = 99 - 33
=> 3x = 66
=> x = 66 : 3
=> x = 22
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47. (23 + 50)- 23. ( 47+50 )
= 47. 23+ 47. 50- 23. 47 - 23. 50
=47. 50 - 23. 50
= 50 .( 47 -23)
=50. 24 = 1200
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