①（-3）*（-5/6）*（-9/5）*1/4 =5/2*（-9/5）*1/4 =-2/9*1/4=-1/18② 5/12 - 8/15 * 1/4 *(-3/2) =5/12-2/15*（-3/2）=5/12+1/5=37/60③（-5）* 8 *（-0.25）*(-7)=-40*（-0.25）*（-7）=10*（-7）=-70...