tính nhanh a 15.37.4+120.21+21.5.12 b 14.35.5+10.25.7+20.70 17/07/2021 Bởi Everleigh tính nhanh a 15.37.4+120.21+21.5.12 b 14.35.5+10.25.7+20.70
a, 15.37.4 + 120.21 + 21.5.12 = 60.37 + 60.2.21 + 21.60 = 60.( 37+ 2.21 +21 ) = 60.100 =6000 b, 14.35.5 + 10.25.7 + 20.70 = ( 14.5 ).35 + ( 10.7 ).25 + 20.70 = 70.35 + 70.25 + 20.70 = 70. ( 35 + 25 + 20 ) = 70.80 =5600 Xin hay nhất ! Bình luận
Giải thích các bước giải: a) `15.37.4+120.21+21.5.12` `=60.(37+21)+120.21` `=60.58+120.21` `=120.29+120.21` `=120.(29+21)` `=120.50=6000` b) `14.35.5+10.25.7+20.70` `=70.35+70.25+20.70` `=70.(35+25+20)` `=70.80` `=5600` Bình luận
a, 15.37.4 + 120.21 + 21.5.12
= 60.37 + 60.2.21 + 21.60
= 60.( 37+ 2.21 +21 )
= 60.100
=6000
b, 14.35.5 + 10.25.7 + 20.70
= ( 14.5 ).35 + ( 10.7 ).25 + 20.70
= 70.35 + 70.25 + 20.70
= 70. ( 35 + 25 + 20 )
= 70.80
=5600
Xin hay nhất !
Giải thích các bước giải:
a) `15.37.4+120.21+21.5.12`
`=60.(37+21)+120.21`
`=60.58+120.21`
`=120.29+120.21`
`=120.(29+21)`
`=120.50=6000`
b) `14.35.5+10.25.7+20.70`
`=70.35+70.25+20.70`
`=70.(35+25+20)`
`=70.80`
`=5600`