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

Toán Lớp 6: tìm x a) 25+4 (30-x)=93 b) 96: 2^x+3-(-16)=27+(-8)

Toán Lớp 6: tìm x
a) 25+4 (30-x)=93
b) 96: 2^x+3-(-16)=27+(-8)

Comments ( 2 )

  1. a) 25 + 4(30-x)=93
    ⇒         4(30-x)=93-25
    ⇒         4(30-x)=68
    ⇒             30-x=68:4
    ⇒             30-x=17
    ⇒                   x=30-17
    ⇒                   x=13
    b) 96:2^{x+3}-(-16)=27+(-8)
    ⇒ 96:2^{x+3}+16=19
    ⇒ 96:2^{x+3}     =19-16
    ⇒ 96:2^{x+3}     = 3
    ⇒      2^{x+3}     =96:3
    ⇒       2^{x+3}    = 32
    ⇒      2^{x+3}    = 2^5
    ⇒           x+3     = 5
    ⇒          x          = 5-3
    ⇒         x           = 2

  2. 25+4.(30-x)=93
    4.(30-x)=93-25
    4.(30-x)=68
    30-x=68:4
    30-x=17
    x=30-17
    x=13
    b, 96:2^x+3-(-16)=27+(-8)
    96:2^x+3+16=19
    96:2^x+19=19
    96:2^x=19-19
    96:2^x=0 (sai đề)
     

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