1.7-1.7x0.2÷6.8 （可以简便计算吗？可以的话怎么写） 1.25x3.2x0.25可以简便吗？ 4.65x5.4+5.4x5.35可以

1.7-1.7x0.2÷6.8 =(1.7x6.8-1.7x0.2)÷6.8 =1.7x6.6÷6.8 =1.7x6.6÷(1.7x4) =1.65 1.25x3.2x0.25 =1.25x0.8x4x0.25 =(1.25x0.8)x(4x0.25) =1x1 =1 4.65x5.4+5.4x5.35 =(4.65+5.35)x5.4 =10x5.4 =54 9.4÷｛(1.3+1.4)÷0.27] = 9.4÷｛2.7÷0.27] = 9.4÷10 =0.9