(1)8[4/5]+5.25+1.2+2[3/4],
=8.8+5.25+1.2+2.75,
=(8.8+1.2)+(5.25+2.75),
=10+8,
=18;
(2)4[11/12]+49[11/12]+499[11/12]+4999[11/12]+[1/3],
=4+[11/12]+49+[11/12]+499+[11/12]+4999+[11/12]+[4/12],
=(4+49+499+4999)+[11/12]×4+[4/12],
=(4+50-1+500-1+5000-1)+([11/12]×4+[4/12]),
=5551+4,
=5555;
(3)100÷[1/4]×4-100,
=100×4×4-100,
=1600-100,
=1500;
(4)11+192+1993+19994+199995,
=(10+1)+(200-8)+(2000-7)+(20000-6)+(200000-5),
=222210-(8+7+6+5-1),
=222210-25,
=222185;
(5)100-98+96-94+92-90+…+76-74+72,
=(100-98)+(96-94)+(92-90)+…+(76-74)+72,
=2+2+2+2+2+2+2+72,
=14+72,
=86.