Toán a) 999 . 21 b) 17. 25+17.42 + 173 c) 25. 175- 25.75 21/07/2021 By Peyton a) 999 . 21 b) 17. 25+17.42 + 173 c) 25. 175- 25.75
a) 999.21=(1000-1).21 =1000.21-1.21 =21000-21 =20979 b)17.25+17.42+173 =17(25+42)+173 =17.77+173 =1309+173 =1482 c)25.175-25.75 =25.(175-75) =25.100 =2500 Trả lời
a) 999.21=(1000-1).21 =1000.21-1.21 =21000-21 =20979 b)17.25+17.42+173=17.(25+42) +173 =17.67+173 =1139+173 =1312 c)25.175-25.75=25.(175-75) =25.100 =2500 Trả lời
a) 999.21=(1000-1).21
=1000.21-1.21
=21000-21
=20979
b)17.25+17.42+173
=17(25+42)+173
=17.77+173
=1309+173
=1482
c)25.175-25.75
=25.(175-75)
=25.100
=2500
a) 999.21=(1000-1).21
=1000.21-1.21
=21000-21
=20979
b)17.25+17.42+173=17.(25+42) +173
=17.67+173
=1139+173
=1312
c)25.175-25.75=25.(175-75)
=25.100
=2500