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
199.9*19.98-199.8*19.97
199.9×19.98-19.99×199.8用简便方法怎么计算
199.9×19.98-199.8×19.97(简便计算,递等式)给好评.
第一讲全部答案,2000×199.9-1999×199.8 19.98×37-199.8×1.9+1.998×820 9.56×4.18-7.3×4.18-0.26×4.18
199.9*19.98-199.8*19.97用简便方法计算(要过程).
199.9×19.98-19.98×1.987 简算
2000×199.9-1999×199.8
19.98×51+199.8×3.9+199.8是多少
计算 199.8+19.98+1.998+2.222
199.8+19.98+1.998+2.222的简便方法?
1998+199.8+19.98+1.998+2.222=
199.8+19.98+1.998+2.222 要过程
19.98×37-199.8×1.9 1998×0.
1998+199.8+19.98+1.998简便算法
199.9×29.98-19.99×199.8求简便计算
2000*199.9-1999*199.8 简便计算
2000×199.9-1997×199.8的简便计算
19.98*37+199.8*2.3+9.99*80=简算