7.6×0.19+0.76×8.1
=0.76x1.9+0.76x8.1
=0.76x(1.9+8.1)
=0.76x10
=7.6你怎么把7.6改成0.76啦对呀7.6x0.19=0.76x10x0.19=0.76x1.9 呀，变成这样就可以分配律呀