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

Toán Lớp 7: 334-(-75)+[(-175)-34] 68-(-45)-[368-(-145)

Toán Lớp 7: 334-(-75)+[(-175)-34]
68-(-45)-[368-(-145)

Comments ( 2 )

  1. 334 – ( -75 ) + [ ( -175 ) – 34 ]
    = 334 + 75 – 175 – 34
    = ( 334 – 34 ) + ( 75 – 175 )
    = 300 + ( -100 )
    = 300 – 100
    = 200
    $\text{ _______________________________ }$
    68 – ( -45 ) – [ 368 – ( -145 ) ]
    = 68 + 45 – [ 368 + 145 ]
    = 68 + 45 – 368- 145
    = ( 68 – 368 ) + ( 45 – 145 )
    = ( -300 ) + ( -100 )
    = ( -400 )
     

  2. 334-(-75)+[(-175)-34]
    =334+75-175-34
    =(334-34)+(75-175)
    =300+(-100)
    =200
    ————-
    68-(-45)-[368-(-145)]
    =68+45-368+145
    =(68-368)+(45-145)
    =-300+(-100)
    =-400

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