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Calculati:
a)5739*4325-4325*5739-5738;
b)(1990+1989*1990)/(1990*1991-1990);
c)(11+22+33+...+88+99)/(11*45);
d)12+10*(6+14)/4-50/25;
e)1+22*(32/8-1)/6+19870;
f)(32-23)*(42-24)*(25-52)*(26-62)*(27-72);
g)6+2*[(3*52-22*18/32+3*11)/22]