Question

7.2㐅2.5÷0.4简便运算

Answer 1

7.2×2.5÷0.4的简便运算过程如下：
7.2×2.5÷0.4
=(1.8×4)×2.5÷0.4 ←把7.2分解成(1.8×4)
=1.8×10÷0.4 ←4×2.5=10
=0.9×2×5×2÷0.4 ←把1.8分解成(0.9×2)，10分解成(5×2)
=0.9×5×2×2÷0.4 ←运用乘法交换律，2×5改写成5×2
=4.5×10 ←0.9×5相乘得4.5，2×2÷0.4 相乘后再相除得10
=45

Answer 2

把0.4化为4/10，除以0.4就是乘以10/4,把2.5也化为10/4

7.2㐅2.5÷0.4=7.2㐅100/4/4=180/4=45

Answer 3

7.2x2.5÷0.4
=（7.2÷0.4）x2.5
=18x2.5
=(20-2)x2.5
=20x2.5-2x2.5
=50-5
=45