你好简便计算过程如下39×8+39-39×4=39×8+39×1-39×4=39×(8+1-4)=39×5=(40-1)×5=40×5-1×5=200-5=195望采纳
39×8+39-39×4=39×(8+1-4)=39×5=(40-1)×5=40×5-1×5=200-5=195
=39x(8+1-4)=39x5=195