4x÷9=3.6方程两边同乘以9，得4x÷9*9=3.6*94x=32.4方程两边同除以4，得4x/4=32.4/4x=8.1
∵4x÷9=3.6 4x=3.6×9∴4x=32.4 x=32.4÷4∴x=8.1
4×÷9=3.64×=3.6×9×=0.9×9x=8.1
计算步骤：4x=3.6*9x=3.6*9/4x=8.1
