7.3*14.2-4.2怎么简便计算?7.3 x (10+ 4.2 ) - 4.2= 7.3 x 10 + 7.3x4.2 - 1x 4.2= 73 + (7.3-1) x 4.2= 73 + 6.3 x 4.2 = 73 +26.46=99.46 施主,我看你骨骼清奇,器宇轩昂,且有慧根,乃是万中无一的武林奇才.潜心修习...