0.4x=192 解:0.4x÷0.4=192÷0.4 x=480 5.6+x=10 解:5.6+x-5.6=10-5.6 x=4.4 5.4÷x=3 解:5.4÷x×x=3x 3x=5.4 3x÷3=5.4÷3 x=1.8 6.2x+23=41.6 解:6.2x+23-23=41.6-23 6.2x=18.6 6.2x÷6.2=18.6÷6.2 x=3