a,-(-78-2013)+(78+87) b,-2020-(-345-89-2020)+11 c,79-(-78+79-456)+22 d,-53+(-76)-(-53)-(-76) e,789-(-78+789-567) f,(2-3)-(-3+4)-(-4+5)-(-5+6) Bỏ ngoặc

0 bình luận về “a,-(-78-2013)+(78+87) b,-2020-(-345-89-2020)+11 c,79-(-78+79-456)+22 d,-53+(-76)-(-53)-(-76) e,789-(-78+789-567) f,(2-3)-(-3+4)-(-4+5)-(-5+6) Bỏ ngoặc”

1. a. – ( -78 – 2013 ) + ( 78 + 87 ) 
   = 78 + 2013 + 78 + 87 
   = ( 78 + 78 ) + ( 2013 + 87 ) 
   = 156 + 2100
   = 2256

   b. -2020 – ( -345 – 89 – 2020 ) + 11
   = -2020 + 345 + 89 + 2020 + 11
   = ( -2020 + 2020 ) + ( 89 + 11 ) + 345
   = 0 + 100 + 345
   = 445 

   c. 79 – ( -78 + 79 – 456 ) + 22
   = 79 + 78 – 79 + 456 + 22
   = ( 79 – 79 ) + ( 78 + 22 ) + 456
   = 0 + 100 + 456
   = 556

   d. -53 + ( -76 ) – ( -53 ) – ( -76 )
   = -53 – 76 + 53 + 76 
   = ( – 53 + 53 ) + ( -76 + 76 )
   = 0

   e. 789 – ( -78 + 789 – 567 ) 
   = 789 + 78 – 789 + 567 
   = ( 789 – 789) + ( 78 + 567 ) 
   = 0 + 645
   = 645 

   f. ( 2 – 3 ) – ( -3 + 4 ) – ( -4 + 5 ) – ( -5 + 6 ) 
   = -1 – 1 – 1 – 1
   = -4

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2. a.$-(-78-2013)+(78+87)^{}$

   $=78+2013+78+87$

   $=78+78+(2013+87)$

   $=78+78+2100$

   $=156+2100$

   $=2256$

   b. $-2020-(-345-89-2020)+11^{}$

   $=-2020+345+89+2020+11^{}$

   $=(-2020+2020)+(89+11)+345$

   $=0+100+345$

   $=445$

   c. $79-(-78+79-456)+22^{}$

   $=79+78-79+456+22$

   $=(79-79)+(78+22)+456$

   $=0+100+456$

   $=556$

   d. $-53+(-76)-(-53)-(-76)^{}$

   $=-53-76+53+76$

   $=(-53+53)+(-76+76)$

   $=0$

   e. $789-(-78+789-567)^{}$

   $=789+78-789+567$

   $=(789-789)+78+567$

   $=645$

   f. $(2-3)-(-3+4)-(-4+5)-(-5+6)^{}$

   $=-1-1-1-1$

   $=-4$

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