已知-x+2y=5,那麼5(x-2y)*2-3(x-2y)-60的值為_

已知-x+2y=5,那麼5(x-2y)*2-3(x-2y)-60的值為_

因為-X+2y=5
所以x-2y=-5
所以原式=5x(-5)2-3(-5)-60=5x25-(-15)-60=125+15-60=80