10m3:5m3= - 2, 10m+5m= - 15m, 100p3:50p2= - 2p, 100p3.2p= - 200p4, 12p-6p+3p= - 9p, 2m+10m+5n= - 12m+5n=, 25m+10m+2n= - 35m+2n, 2m4.3m2= - 6m6=, 5p.2p= - 10p2, 15p-4p= - 11p,

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