13.2x+9x=33.3 5.4x+x=12.8 x-0.36x=16
解:22.2x=33.3 6.4x=12.8 0.64x=16
x=33.3/22.2 x=2 x=25
x=1.5
13.2x+9x=33.3
解:(13.2+9)x=33.3
22.2x=33.3
x=1.5
5.4x+x=12.8
j解:6.4x=12.8
x=2
x-0.36x=16
解:0.64x=16
x=25