Question

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！

Answer 1

7.2x5.8+0.72x42
=7.2x5.8+7.2x4.2
=7.2x(5.8+4.2)
=7.2x10
=72

Answer 2

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

Answer 3

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

Answer 4

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。