199.7×19.98-199.8×19.96

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*

19.98×51+199.8×3.9+199.8是多少19.98×51+199.8×3.9+199.8是多少19.98×51+199.8×3.9+199.8是多少19.98×51+199.8×3.9+

计算199.8+19.98+1.998+2.222计算199.8+19.98+1.998+2.222计算199.8+19.98+1.998+2.222199.8+19.98+1.998+2.222=1

1999*199.8-1998*199.7怎么简便1999*199.8-1998*199.7怎么简便1999*199.8-1998*199.7怎么简便=199.8（1999-10*199.7）提公因式

19.99*199.8-199.7*19.99简便计算19.99*199.8-199.7*19.99简便计算19.99*199.8-199.7*19.99简便计算19.99*199.8-199.7*1

199.8+19.98+1.998+2.222的简便方法?199.8+19.98+1.998+2.222的简便方法?199.8+19.98+1.998+2.222的简便方法?（199.8+0.2）+(

1998+199.8+19.98+1.998+2.222=1998+199.8+19.98+1.998+2.222=1998+199.8+19.98+1.998+2.222=2222

199.8+19.98+1.998+2.222要过程199.8+19.98+1.998+2.222要过程199.8+19.98+1.998+2.222要过程 

19.98×37-199.8×1.91998×0.19.98×37-199.8×1.91998×0.19.98×37-199.8×1.91998×0.19.98×51199.8×3.9199.8=19

1998+199.8+19.98+1.998简便算法1998+199.8+19.98+1.998简便算法1998+199.8+19.98+1.998简便算法2000+200+20+2-2-0.2-0.

用简便方法计算：1999*199.8-1998*199.7,求求,用简便方法计算：1999*199.8-1998*199.7,求求,用简便方法计算：1999*199.8-1998*199.7,求求,1

2.4*5.8+0.28*4.2简便算法199.7*19.98-199.9*19.962.4*5.8+0.28*4.2简便算法199.7*19.98-199.9*19.962.4*5.8+0.28*4

199.9×19.98-19.99×199.8用简便方法怎么计算199.9×19.98-19.99×199.8用简便方法怎么计算199.9×19.98-19.99×199.8用简便方法怎么计算199.

19.98*37+199.8*2.3+9.99*80=简算19.98*37+199.8*2.3+9.99*80=简算19.98*37+199.8*2.3+9.99*80=简算=199.8*3.7+19

19.98*37-199.8*1.9+1998*0.82的简便运算19.98*37-199.8*1.9+1998*0.82的简便运算19.98*37-199.8*1.9+1998*0.82的简便运算1

用简便方法计算：19.98*37-199.8*1.9+1998*0.82用简便方法计算：19.98*37-199.8*1.9+1998*0.82用简便方法计算：19.98*37-199.8*1.9+1

199.9×19.98-199.8×19.97(简便计算,递等式)给好评.199.9×19.98-199.8×19.97(简便计算,递等式)给好评.199.9×19.98-199.8×19.97(简便

19.98×3.7+199.8×0.23+9.99×8要有过程19.98×3.7+199.8×0.23+9.99×8要有过程19.98×3.7+199.8×0.23+9.99×8要有过程19.98×3

用简便方法计算19.98×37-199.8×1.9+1998×0.82用简便方法计算19.98×37-199.8×1.9+1998×0.82用简便方法计算19.98×37-199.8×1.9+1998

1998+199.8+19.98+1.98+2.222计算过程怎么算1998+199.8+19.98+1.98+2.222计算过程怎么算1998+199.8+19.98+1.98+2.222计算过程怎