5.8×5.6+4.4×3.8＝（2+3.8）*5.6+4.4*3.8＝2*5.6+3.8*5.6+4.4*3.8＝2*5.6+（5.6+4.4）*3.8＝11.2+10*3.8＝11.2+38＝49.2
原式=5.8x（5.6+4.4）=5.8x10=58
