1.6x-2.9=11-4x即1.6x+4x=11+2.9即5.6x=13.9即x=139/56
1.6x-2.9=11-4x解:1.6x+4x=11+2.95.6x=13.9x=139/56
1.6x+4x=11+2.95.6X=13.9x=13.9÷5.6x=139/56x=2又27/56