199.9*19.98-199.8*19.97

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199.9*19.98-199.8*19.97199.9*19.98-199.8*19.97199.9*19.98-199.8*19.97=19.99*199.8-199.8*19.97=199.8*

199.9*19.98-199.8*19.97
199.9*19.98-199.8*19.97

199.9*19.98-199.8*19.97
=19.99*199.8-199.8*19.97
=199.8*(19.99-19.97)
=(200-0.2)*0.02
=4-0.004
=3.996

199.9*19.98-199.8*19.97=19.99*199.8-199.8*19.97=199.8*(19.99-19.97)=199.8*0.002=0.3996

原式=199.8×(19.99-19.97)
=(200-0.2)×0.02
=200×0.02-0.2×0.02
=4-0.004
=3.996