a) 12 + 9 b) 30 – (-32) c) 61 + (+14) d) 56 – (-22) nhanh giúp tui vứi

$a)$ $12$ $+$ $9$

$=$ $21$

$b)$ $30$ $-$ $(-32)$

$=$ $30$ $+$ $32$

$=$ $62$

$c)$ $61$ $+$ $(+14)$

$=$ $61$ $+$ $14$

$=$ $75$

$d)$ $56$ $-$ $(-22)$

$=$ $56$ $+$ $22$

$=$ $78$