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11)a) 180=2·2·3·3·5
b)864=2·2·2·2·2·3·3·3
c)924=2·2·3·7·11
d)2520=2·2·2·3·3·5·7
12a) x=8, y=52 8=2·2·2 52=2·2·13
NWD=2·2=4
NWW=x·y÷NWD=8·52÷4=104
b)x=24, y=64 24=2·2·2·3 64=2·2·2·2·2·2
NWD=2·2·2=8
NWW=24·64÷NWD=1536÷8=192
c)x=20, y=135 20=2·2·5 135=3·3·3·5
NWD=5
NWW=20·135÷NWD=2700÷5=540
d)x=22, y=125 22=2·11 125=5·5·5
NWD=brak
e)x=504,y=588 504=2·2·2·3·3·7 588=2·2·3·7·7
NWD=2·2·3·7=84
NWW=504·588÷84=296352÷84=3528
f)x=12, y=1680 12=2·2·3 1680=2·2·2·2·3·5·7
NWD=2·2·3=12
NWW12·1680÷12=20160÷12=1680