Question

tinh bang cach thuan tien

125+156+875

789+987+211

ket ban luon nhe mk tk cho

Answer 1

(125+875)+156

=    1000 +156 =1156

(789+211)+987

=1000 +987=1987

Answer 2

125 + 156 + 875

= ( 125 + 875) + 156

= 1000 + 156 = 1165

789 + 987 + 211

= ( 789 + 211 ) + 987

= 1000 + 987 = 1987

Answer 3

=[ 125 + 875 ] + 156 

=1000 + 156 = 1156

=[ 789 + 211 ] + 987

=1000 + 987=1987