calculati: a) (7/8+9/8)×7-2²;
b)3×(1/3+1/4+1/12)-1;
c)5-(1/2+1/15+1/30)×5;
d) 1/2+1/3+1/6;
e)1/2+1/4+1/7+1/14+1/28;
f) (5/4+1/3-11/12)×3-15⁰;
Urgent!! Dau coroana!!!
​