Toán Lớp 6: c) 512-87+[(-12)-(-487)] d) [113+(-56)]-[(-56)-(-113)]

TRẢ LỜI

1. Giải đáp:

   c) 512 – 87 + [(-12) – (-487)]

   = 512 – 87 + [(-12) + 487]

   = 512 – 87 + [-(487 – 12)]

   = 512 – 87 + 475

   = 425 + 475

   = 900

   d) [113 + (-56)] – [(-56) – (-113)]

   = [+(113 – 56)] – [(-56) + 113]

   = 57 – [+(113 – 56)]

   = 57 – 57

   = 0

   #tambip

   Trả lời
2. c)

   512 – 87 + [ ( -12 ) – ( -487 ) ]

   = 512 – 87 + [ -12 + 487 ]

   = 512 – 87 – 12 + 487

   = ( 512 – 12 ) + ( -87 + 487 )

   = 500 + 400

   = 900

   d)

   [ 113 + ( -56 ) ] – [ ( -56 ) – ( -113 ) ]

   = [ 113 – 56 ] – [ -56 + 113 ]

   = [ 113 – 56 ] – [ 113 – 56 ]

   = 0

   Trả lời