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a fost răspuns

calculati:
a) x=1-2+3-4+...+45-46 ;
b)y=1-2+3-4+....+(2n-1)-2n;
c)z=/3-5/+/7-4/;
d)t=/1-2 la puterea n/+/2la puterea n -3 la puterea n+/3la puterea n-4la puterea n/+....+/9 la puterea n-100la puterea n/- /1-100 la puterea n/.​