120÷20=
用简便方法计算.(8+40)×25 (125×25)×(8×4) 34×102 72×125.
用简便方法计算下面各题.143+69+357+431 36×98+36×2 125×882300÷25÷ 103×12 234×15﹣15×134.
99×34.
简便算法.7.28﹣3.16﹣2.84 6.3+18.2+13.7 7.6×10.1 8.16×2.4+7.6×8.16.
用简便方法计算.5.39+5.25+4.61+4.755.83﹣(0.46+1.83)﹣0.54.