a) 1047 + 2806 + 953 + 194
= ( 1047 + 953 ) + ( 2806 + 194 )
= 2000 + 3000
= 5000
b) 2010 - 468 - 532
= 2010 - ( 468 + 532 )
= 2010 - 100
= 1010
c) 1935 - 873 + 65 - 127
= ( 1935 + 65 ) - ( 873 + 127 )
= 2000 - 1000
= 1000
d) 3042 - (2500- 958)
= 3042 - 2500 + 958
= ( 3042 + 958 ) - 2500
= 4000 - 2500
= 1500
a) 1047 + 2806 + 953 + 194
= (1047 + 953) + (2806 + 194)
= 2000 + 3000
= 5000
b) 2010 - 468 - 532
= 2010 - (468 + 532)
= 2010 - 1000
= 1010
c) 1935 - 873 + 65 - 127
= (1935 + 65) - (873 + 127)
= 2000 - 1000
= 1000
Tính bằng cách thuận tiện nhất
a) 1047 + 2806 + 953 + 194
= (1047+953)+(2806+194)
= 2000+3000=5000
b) 2010 - 468 - 532
= 2010-(468+532)
= 2010-1000=1010
c) 1935 - 873 + 65 - 127
= (1935+65)-(873+127)
= 2000-1000=1000
d) 3042 - (2500- 958)
= 3042-2500+958
= (3042+958)-2500
= 4000-2500=1500
d) 3042 - (2500 - 958)
= 3042 - 2500 + 958
= (3042 + 958) - 2500
= 4000 - 2500
= 1500
