7.24×0.1+0.5×72.4+0.049×724.
问题描述:
7.24×0.1+0.5×72.4+0.049×724.
答
7.24×0.1+0.5×72.4+0.049×724
=7.24×0.1+5×7.24+4.9×7.24
=7.24×(0.1+5+4.9)
=7.24×10
=72.4