设小卡车每辆运x吨,则大卡车每辆运x+1.9吨. 10×(x+1.9)+15x=64 10x+19+15x=64 25x+19=64 25x+19-19=64-19 25x=45 25x÷25=45÷5 x=1.8则在卡车:x+1.9=3.7答:每辆大卡车运3.7吨,小卡车运1.8吨.