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

Toán Lớp 6: (2x-39).7+3=80 [(3x+1)^3]^5=15^0 2436.(5x+103)=12 294-(7x-217)=3^8.3^11:3^16+6^2

Toán Lớp 6: (2x-39).7+3=80
[(3x+1)^3]^5=15^0
2436.(5x+103)=12
294-(7x-217)=3^8.3^11:3^16+6^2

Comments ( 2 )

  1. a) (2x-39).7+3=80
    => (2x-39).7=80-3
    => (2x-39).7=77
    => (2x-39)=77:7
    => 2x-39=11
    => 2x=11+39
    => 2x=50
    => x=50:2
    => x=25
    Vậy x=25
    b) [(3x+1)^3]^5=15^0
    => [(3x+1)^3]^5=1
    => (3x+1)^3=1
    => 3x+1=1
    => 3x= 1-1
    => 3x=0
    => x=0
    Vậy x=0
    c) 2436.(5x+103)=12
    => 12180x+ 250908=12
    => 12180x=12-250908
    => 12180x= -250896
    => x= -250896: 12180
    => x= -20,6
    Vậy x= -20,6
    d) 294-(7x-217)=3^8.3^11:3^16+6^2
    => 294-(7x-217)=63
    => 7x-217=294-63
    => 7x-217=231
    => 7x=231+217
    => 7x= 448
    => x=448:7
    => x=64
    Vậy x=64

  2. Giải đáp + Lời giải và giải thích chi tiết:
    (2x-39).7+3=80
    (2x-39).7=80-3=77
    2x-39=77:7=11
    2x=11+39=50
    x=50:2=25
    $[(3x+1)^{3}]^{5}$=$15^{0}$
    $[(3x+1)^{3}]^{5}$=0
    ⇒ x=0

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