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giúp mk đi
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a) (x - 45).27 = 0
x - 45 = 0 : 27
x = 0 + 45
x = 45
b) 23.(42 - x) = 23
42 - x = 23 : 23
42 - x = 1
x = 42 - 1
x = 41
\(a,\left(x-45\right).27=0\)
\(x-45=0\)
\(x=45\)
\(b,23.\left(42-x\right)=23\)
\(42-x=1\)
\(x=42-1\)
\(x=41\)
Thx you vr much !! chúc buổi tối tốt lành
( x - 45 ) . 27 = 0
x - 45 = 0
x = 45 + 0
x = 45
23 . ( 42 - x ) = 23
42 - x = 23 : 23
42 - x = 1
x = 42 = 1
x = 41
Bài làm :
\(a\text{ )}\left(x-45\right).27=0\)
\(\Leftrightarrow x-45=0\div27=0\)
\(\Leftrightarrow x=0+45=45\)
\(b\text{ )}23.\left(42-x\right)=23\)
\(\Leftrightarrow42-x=1\)
\(\Leftrightarrow x=42-1=41\)
a, \(\left(x-45\right)\cdot27=0\)
\(\Rightarrow x-45=0\)
\(x=0+45\)
\(x=45\)
b, \(23\cdot\left(42-x\right)=23\)
\(\Rightarrow42-x=1\)
\(x=42-1\)
\(x=41\)
a . ( x - 45 ) . 27 = 0 b . 23 . ( 42 - x ) = 23
( x - 45 ) = 0: 27 ( 42 - x ) =23 : 23
( x - 45 ) = 0 ( 42 - x ) = 1
x = 27+45 x = 42-1
x =72 x = 41