简便计算:7.2乘以5.8加0.72乘以42怎么做7.2x5.8+0.72x42=?注意:是简便计算!

来源：学生作业帮助网编辑：作业帮时间：2024/04/28 05:27:00

简便计算:7.2乘以5.8加0.72乘以42怎么做7.2x5.8+0.72x42=?注意:是简便计算!
简便计算:7.2乘以5.8加0.72乘以42怎么做
7.2x5.8+0.72x42=?注意:是简便计算!

简便计算:7.2乘以5.8加0.72乘以42怎么做7.2x5.8+0.72x42=?注意:是简便计算!
7.2x5.8+0.72x42
=7.2x5.8+7.2x4.2
=7.2x(5.8+4.2)
=7.2x10
=72

7.2×5.8+0.72×42＝7.2×5.8+7.2×4.2＝7.2×(5.8+4.2)=7.2×10＝72

7.2x5.8+0.72x42
=0.72x58+0.72x42
=0.72x(58+42)
=0.72x100
=72

7.2*5.8+0.72*42
=7.2*5.8+(0.72*10)*(42/10)
=7.2*5.8+7.2*4.2
=7.2*(5.8+4.2)
=7.2*10
=72
根据乘法的性质。

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