## 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

Question

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

in progress 0
1 year 2020-11-06T00:57:41+00:00 2 Answers 81 views 0

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 = $\frac{124}{1065}$

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