16.8*28能简算简算,要算式,
问题描述：
16.8*28能简算简算,要算式,
答
16.8x28
=168X2.8
=(170-2)X(3-0.2)
=170x3-170x0.2-2X3+2x0.2
=510-34-6+0.4
=470.4