вычисли 1)  12x30 2) 16x25 3) 18x14 4) 4x2500 5) 11000x2 6) 3000x3 7) 800x20 8)2000x30 9)1300x200 10)780:2 11) 4800:8 12)5500:5 13) 6400+1900 14)2007-1098 15)11090-4007
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