设这个数为X6X=1.5*4-1.26X=4.8X=4.8/6X=0.8
6x=1.5×4-1.2x=0.8
设该数为X6X = 1.5*4-1.26X = 4.8X =0.8
6x-1.5*4=1.2x=1.2