第一道:2.85-3.17+4.15 第二道:32.4*0.9+3.24*1
问题描述:
第一道:2.85-3.17+4.15 第二道:32.4*0.9+3.24*1
答
2.85-3.17+4.15
=2.85+4.15-3.17
=7-3.17
=3.83
32.4×0.9+3.24×1
=32.4×0.9+32.4×0.1
=32.4×(0.9+0.1)
=32.4