Tính: a) A= 3687 + 9541 + 6313 +459 b) B= 387.2694+7305.387+387 c) C=5871:[928-(247-82).5] d) D= 248: {[(368+232):120-3] +122 + 2006

0 bình luận về “Tính: a) A= 3687 + 9541 + 6313 +459 b) B= 387.2694+7305.387+387 c) C=5871:[928-(247-82).5] d) D= 248: {[(368+232):120-3] +122 + 2006”

1. a , 

   A = 3687 + 9541 + 6313 + 459 = ( 3987 + 6313 ) + ( 9541 + 459 ) = 10300 + 10000 = 20300

   b, 

   B = 387 . 2694 + 7305 . 387 + 387 = 387 . ( 2694 + 7305 + 1 ) = 387 . 10000 = 3870000

   c, 

    C = 5871 : [ 928 – ( 247 – 82 ) . 5] = 5871 : [ 928 – 165 . 5] = 5871 : [ 928 – 825 ] = 5871 : 103 

   = 57 

   d, 

   D= 248 : {[( 368 + 232 ) : 120 – 3 ] +122 + 2006 }

   = 248 : {[600 : 120 – 3 ] +122 + 2006 }

   = 248 : {[5- 3 ] +122 + 2006 }

   = 248 : {2+122 + 2006 }

   = 248 : 2130 = $\frac{124}{1065}$ 

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2. a)
   3687+9541+6313+459
   (3687+6313)+(9541+459)
   =10 000+10 000
   =20 000

   b)
   387.2694+7305.387+387
   = 387.2694+7305.387+387.1
   =387.(2694+7305+1)
   =387.10 000
   =3 870 000

   c)
   5871:[928-(247-82).5]
   =5871:[928-165.5]2
   =5871:[928-825]
   =5871:103
   =57

   d)
   248:{[(368+232):120-3]+122+2006}
   =248:{[600:120-3]+122+2006
   =248:{[5-3]+122+2006
   =248:{2+122+2006}
   =248:{124+2006}
   =248:2130
   =124 / 1065

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