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284 99 284????????
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=284*(99+1)=284*100=28400
284+284*99=284*1+284*99=284*(1+99)=284*100=28400
284*99+284=284*(99+1)=284*100=28400
99*284+284=284*(99+1)=284*100=28400
284*(100+1)-284
328-(284-172)=328-284+172=328+172-284=500-284=216
??????284?(284?35)284?(284?35)=284-284-35=0-35=-35
284 x9.9+24.8=28.4 x99+24.8=28.4 x(99+1)=24.8x100=2480
2843?593????????2843?593=2843-(600-7)=2843-600+7=2243+7=2250
198+284=198+2+282=482
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