解:2.4÷2x=0.3 2x=2.4÷0.3 2x=8 x=4
2.4÷2x=0.32.4=0.3X2x2.4=0.6ⅹx=2.4÷0.6ⅹ=4
2.4÷2x=0.31.2÷x=0.3x=1.2÷0.3x=4