几道算术题和操作题,不是很难,算术题要求最好简便!(1)1.6x3/4-2/5除1.2(2)5/9+4/9X3/4(3)12.65-(3.65-1.8)(4)2除1.25除0.25（5）5/6与.06的差,除以2与4/5的和,商是多少?（6）3/4的倒数乘以1.2,再加上1.5的2/3,

Question

几道算术题和操作题,不是很难,算术题要求最好简便!
(1)1.6x3/4-2/5除1.2 (2)5/9+4/9X3/4 (3)12.65-(3.65-1.8) (4)2除1.25除0.25 （5）5/6与.06的差,除以2与4/5的和,商是多少?（6）3/4的倒数乘以1.2,再加上1.5的2/3,结果是多少?

Answer 1

(1)1.6x3/4-2/5除1.2 (2)5/9+4/9X3/4 (3)12.65-(3.65-1.8)
=8/5*3/4-2/5*5/6 =1/4*4/9+4/9+4/9*3/4 =12.65-3.65+1.8
=6/5-1/3 =4/9*(1/4+1+3/4) =9+1.8
=18/15-5/15 =4/9*2 =10.8
=13/15 =8/9
9
(4)2除1.25除0.25 5）5/6与.06的差,除以2与4/5的和,商是多少?
=2*4/5*4 (5/6-0.06)/
=2/5