Question

tính các tổng sau

a ) [ 25 + ( -15 ) ] + ( -29 )

b ) 512 - ( -88) - 400 - 125 

c ) -(-310 ) + ( -210 - 907 + 125 )

d ) 2004 - ( 1975 ) - ( 2000 ) + 2005

Answer 1

a) = -19

b) = 325

c) = -682

d) = 34

Answer 2

a ) [ 25 + ( -15 ) ] + ( -29 ) = -19

b ) 512 - ( -88) - 400 - 125 = 75

c ) -(-310 ) + ( -210 - 907 + 125 )= - 682

d ) 2004 - ( 1975 ) - ( 2000 ) + 2005= 34

hok tốt .

Answer 3

a,[ 25 + ( -15 ) ] + ( -29 )

= 10 + ( -29 )

= -19

b, 512 - ( -88 ) - 400 - 125

= [ 512 - ( -88 ) ] - 400 - 125

= 600 - 400 - 125

= 200 - 125 

= 75

c, - ( -310 ) + ( -210 - 907 + 125 )

= 310 + ( -210 - 907 +125 )

= 310 + ( -1117 + 125 )

= 310 + ( - 992 )

= - 682

 d, 2004 - ( 1975 ) - ( 2000 ) + 2005

= 2004 - 1975 - 2000 + 2005 

= ( 2004 - 1975 ) - 2000 + 2005

= 29 - 2000 + 2005

= ( -1971 ) + 2005

= 34