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36*102=36*(100+2)=36*100+36*2=3600+72=3672975-157-43=975-(157+43)=975-200=7753600÷18÷2=3600÷(18*2)=3600÷36=100
36x102=36x(100+2)=3600+72=3672975-157-43=957-(157+43)=957-200=7573600/18/2=200/2=2