原式=3.8*10+3.8*0.2=38+0.76=38.76
两种方法
1、3.8*(10+0.2)=3.8*10.2=38.76
2、3.8*10+3.8*0.2=38+0.76=38.76
望采纳哟......
原式=(4-0.2)*(10+0.2)=40-0.2*10+0.2*4-0.2*0.2=40-2+0.8-0.04=38.76
3.8×(10+0.2)
=3.8x10+3.8x0.2
=38+0.76
=38.76
希望能帮到你
=3.8*10+3.8*0.2
=38+0.76
=38.76