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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 6: a)196:4-12.(-5) b)-37.(1-382)-(382.37) c)465+[(-38)+(-465)]-[12-(-42)] d)(-2).x-(-21)=1 e)(3x-2^2).7^3=7^4 g)(2x-45).5^21=5^23 e)20 chi

Toán Lớp 6: a)196:4-12.(-5)
b)-37.(1-382)-(382.37)
c)465+[(-38)+(-465)]-[12-(-42)]
d)(-2).x-(-21)=1
e)(3x-2^2).7^3=7^4
g)(2x-45).5^21=5^23
e)20 chia hết cho x và x chia hết cho 5
Ai giúp em Em vote cho 5 sao

Comments ( 1 )

  1. $ a) 196:4-12.(-5)=49-(-60)=49+60=109 $
    $ b) -37(1-382)-(382.37) = -37.(-37).(-382)-(382.37) = -37.[(-37).(-382) – (382.37)] = -37.0 = 0 $
    $ c) 465+[(-38)+(-465)]-[12-(-42)] = 465+(-38)+(-465)-(12+42)=[465+(-465)]+(-38) – 12 – 42 = 0 + ( -92 ) = -92 $
    $ d)(-2).x-(-21)=1 $ 
    $ ( -2).x+21=1$
    $ (-2).x=1-21=-20 $
    $ x=-20:(-2)=10 $ 
    $ e)(3x-2^2).7^3=7^4 $ 
    $ 3x-4=7^4:7^3=7 $
    $ 3x=7+4=11 $
    $ x=11:3=11/3 $ 
    $ g)(2x-45).5^{21}=5^{23} $
    $ 2x-45=5^{23}:5^{21}=5^2=25 $ 
    $ 2x =25+45=70 $
    $ x=70:2=35 $
    $ 20 ⋮ x ⇒ x = { ±1 ; ±2 ; ±4 ; ±5 ; ±10 ; ±20 } $
    $ x  ⋮ 5 ⇒ x = { ±5 ; ±10 ; ±20 } $
     

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222-9+11+12:2*14+14 = ? ( )