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

Toán Lớp 6: 12 : { 390 ÷ [ 50 – (125 + 35 × 7 ) ] } 1200 – ( 1500 × 2 + 1800 × 5 +1800 × 2 ÷ 3 ) Giai giup minh vơi a minh se vote 5 sao xin cam ơn

Toán Lớp 6: 12 : { 390 ÷ [ 50 – (125 + 35 × 7 ) ] }
1200 – ( 1500 × 2 + 1800 × 5 +1800 × 2 ÷ 3 )
Giai giup minh vơi a minh se vote 5 sao xin cam ơn !

Comments ( 2 )

  1. Lời giải và giải thích chi tiết:
    a, 12 : { 390 : [ 50 – ( 125 + 35 x 7 )]}
    = 12 : [ 390 : ( 50 – 370 )]
    = 12 : [ 390 : ( – 320 )]
    = 12 : ( -390/320 )
    = -128/13
    b, 1200 – ( 1500 x 2 + 1800 x 5 + 1800 x 2 : 3 )
    = 1200 – [ 1500 x 2 + 1800 x ( 5 + 2 ) : 3 ]
    = 1200 – ( 3000 + 1800 x 7 : 3 )
    = 1200 – ( 3000 + 12600 : 3 )
    = 1200 – ( 3000 + 4200 )
    = 1200 – 7200
    = – 6000

  2. a) 12 : { 390 : [ 50 – ( 125 + 35 xx 7 )]}

    = 12 : [ 390 : ( 50 – 370 )]

    = 12 : [ 390 : ( – 320 )]

    = 12 : ( -390/320 )

    = -128/13

    b) 1200 – ( 1500 xx 2 + 1800 xx 5 + 1800 xx 2 : 3 )

    = 1200 – [ 1500 xx 2 + 1800 xx ( 5 + 2 ) : 3 ]

    = 1200 – ( 3000 + 1800 xx 7 : 3 )

    = – 6000

     

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