用简便方法计算 用简便方法计算 3.45×102 0.47×0.5×0.8 0.46×1.9+0.54×1.9
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/24 22:48:54
![用简便方法计算 用简便方法计算 3.45×102 0.47×0.5×0.8 0.46×1.9+0.54×1.9](/uploads/image/z/32541-69-1.jpg?t=%E7%94%A8%E7%AE%80%E4%BE%BF%E6%96%B9%E6%B3%95%E8%AE%A1%E7%AE%97+%E7%94%A8%E7%AE%80%E4%BE%BF%E6%96%B9%E6%B3%95%E8%AE%A1%E7%AE%97+3.45%C3%97102+0.47%C3%970.5%C3%970.8+0.46%C3%971.9%2B0.54%C3%971.9)
用简便方法计算 用简便方法计算 3.45×102 0.47×0.5×0.8 0.46×1.9+0.54×1.9
用简便方法计算 用简便方法计算 3.45×102 0.47×0.5×0.8 0.46×1.9+0.54×1.9
用简便方法计算 用简便方法计算 3.45×102 0.47×0.5×0.8 0.46×1.9+0.54×1.9
3.45×102
=3.45×(100+2)
=3.45×100+3.45×2
=345+6.9
=351.9
0.47×0.5×0.8
=0.47×(0.5×0.8)
=0.47×0.4
=0.188
0.46×1.9+0.54×1.9
=(0.46+0.54)×1.9
=1×1.9
=1.9