Bỏ dấu ngoặc rồi tính ${a.10-[12-(-9-1)]}$ ${b. (38-29+43)-(43+38)}$ ${c. 271-[(-43)+271-(-17)]}$ ${d. -144-[29-(+144)

2 bình luận về “Bỏ dấu ngoặc rồi tính ${a.10-[12-(-9-1)]}$ ${b. (38-29+43)-(43+38)}$ ${c. 271-[(-43)+271-(-17)]}$ ${d. -144-[29-(+144)”

1. $a)10-[12-(-9-1)]$

   $=10-[12-(-10)]$

   $=10-(12+10)$

   $=10-12-10$

   $=(10-10)-12$

   $=-12$

   b)(38-29+43)-(43+38)

   =38-29+43-43-38

   =(38-38)-29+(43-43)

   =-29

   c)271-[(-43)+271-(-17)]

   =271-(-43+271+17)

   =271+43-271-17

   =(271-271)+(43-17)

   =26

   d)-144-[29-(144)-(+144)]

   =-144-(29-144-144)

   =-144-29+144.2

   =-144-29+288

   =115

   Trả lời
2. a)

   10 – [ 12 – ( – 9 – 1 ) ]

   = 10 – ( 12 + 9 + 1 )

   = 10 – 22

   = – 12

   b)

   ( 38 – 29 + 43 ) – ( 43 + 38 )

   = 38 – 29 + 43 – 43 – 38

   = ( 38 – 38 ) + ( 43 – 43 ) + (-29)

   = -29

   c)

   271 – [( -43 ) + 271 – (-17 ) ]

   = 271 + 43 – 271 – 17

   = ( 271 – 271 ) + ( 43 – 17 )

   = 26

   d)

   -144 – ( 29 – 144 – 144 )

   =-144 – 29 + 144 + 144

   = (-144 + 144 ) + (-29 + 144 )

   = 115

   Trả lời