原式=5.6x3.8+0.19x36+2.5x3.6 =5.6x3.8+1.9x3.6+2.5x3.6 =5.6x3.8+(1.9+2.5)x3.6 =5.6x3.8+4.4x3.6 =(10-4.4)x3.8+4.4x3.6 =10x3.8-4.4x3.8+4.4x3.6 =38+4.4x(-3.8+3.6) =38-0.88 =37.12