Question

Giải giúp em 3 câu này em cảm ơn nhiều ạ 4.17+4.84-4                17.18-18+84.18                             75.12+75.9-21.25

Answer 1

$4.17+4.84-4$

$=4.17+4.84-4.1$

$=4.17+4.84-1.4$

$=4.(17+84-1)$

$=4.100$

$=400$

_________________

$17.18-18+84.18$

$=17.18-18.1+84.18$

$=17.18+18.(-1)+84.18$

$=18.(17-1+84)$

$=18.100$

$=1800$

_____________________

$75.12+75.9$

Answer 2

$75.12+75.9-21.25$

$=75.(12+9)-21.25$

$=75.21-21.25$

$=75.21+21.(-25)$

$=21.(75-25)$

$=21.50$

$=1050$