作业帮用简便方法计算 4.56÷12.5÷0.8 3.2×10.1 38×99+38 7/15÷5+8/15×1/5 1-0.225÷0.9-0.75 65×65/662.5×3.2×12.5
来源：学生作业帮助网 编辑：作业帮 时间：2024/11/24 23:38:41
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用简便方法计算 4.56÷12.5÷0.8 3.2×10.1 38×99+38 7/15÷5+8/15×1/5 1-0.225÷0.9-0.75 65×65/662.5×3.2×12.5
用简便方法计算 4.56÷12.5÷0.8 3.2×10.1 38×99+38 7/15÷5+8/15×1/5 1-0.225÷0.9-0.75 65×65/66
2.5×3.2×12.5
用简便方法计算 4.56÷12.5÷0.8 3.2×10.1 38×99+38 7/15÷5+8/15×1/5 1-0.225÷0.9-0.75 65×65/662.5×3.2×12.5
4.56÷12.5÷0.8
=4.56÷(12.5×0.8)
=4.56÷10
=0.456
3.2×10.1
=3.2×(10+0.1)
=32+0.32
=32.32
38×99+38
=38×(99+1)
=38×100
=3800
7/15÷5+8/15×1/5
=7/15×1/5+8/15×1/5
=(7/15+8/15)×1/5
=1×1/5
=1/5
1-0.225÷0.9-0.75
=1-0.25-0.75
=1-(0.25+0.75)
=1-1
=0
65×65/66
=(66-1)×65/66
=65-65/66
=64又1/66
2.5×3.2×12.5
=2.5×4×0.8×12.5
=10×10
=100