4.7*（1.43-0.53）+0.47
问题描述：
4.7*（1.43-0.53）+0.47
答
4.7*（1.43-0.53）+0.47
=4.7*0.9+0.47*1
=4.7*0.9+4.7*0.1
=4.7*(0.9+0.1)
=4.7*1
=4.7