\(39.8+60.2+21.8=39.8+15.8+21.8=8\left(39+15+21\right)=8.75=600\)
* 39,8 + 60,2 + 21,8
= 100 + 21,8
= 121,8
* 37,7 + 80,3 + 43,7
= 118 + 43,7
= 161,7
* 123,456 +456,321 - 256,444
= 579,777 - 256,444
= 323,333
~ Học tốt ~
* 39.8+60.2+21.8 * 37.7+80.3+43.7 *123.456+456.321-256.444
=8(39+21)+120 =7(37+43)+240 =456(123+321)-256.444
=8.60+120 =7.80+240 =456.444-256.444
=480+120 =560+240 =444(456-256)
=600 =800 =444.200
=88800
Hok tốt
39 . 8 + 60 . 2 + 21 . 8
= 8 . ( 39 + 21 ) + 60 . 2
= 8 . 60 + 60 . 2
= 60 . ( 8 + 2 )
= 60 . 10
= 600
37 . 7 + 80 . 3 + 43 . 7
= 7 . ( 37 + 43 ) + 80 . 3
= 7 . 80 + 80 . 3
= 80 . ( 7 + 3 )
= 80 . 10
= 800
123 . 456 + 456 . 321 - 256 . 444
= 456 . ( 123 + 321 ) - 256 . 444
= 456 . 444 - 256 . 444
= 444 . ( 456 - 256 )
= 444 . 200
= 88 800
=))