这样
2.6×1.9÷2.6×1.9 的脱式计算2.6×1.9÷2.6×1.9 =3.612.6×1.9÷(2.6×1.9 )=1
2.6X1.9÷2.6X1.9=2.6X1.9X1/2.6X1.9=1.9X1.9=(1+0.9)X1.9==1。9+0.9X1.9=1。9+(1-0.1)X1.9==1。9+1.9-0.19=3.61
2.6×1.9÷2.6×1.9 =1.9Ⅹ1,9=3,61