a)22/5+51/9+11/4+3/5+1/3+1/4. b)13/50+0,09+41/100+0,24. c)20,11×36+63×20,11+20,11. d)0,9×438×2+1,8×252+0,6×310×3. e)2,5+4,43-3,21+6,5-2,79. g)(6÷3/5-7/6×6/7)÷(21/5×10/11+57/11). f)1/1×2+1/2×3+1/3×4+....+1/18×19+1/19×20
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