教一教奥数!
("/"代表分号）(代分数一律化成了假分数)
18*3/7＋0.65*8/13-2/7*18+5/13*0.65
425÷17/5+55/12*55/12*24/11-245/24
7.087-14/3*0.72+57/64÷2.85
169/2-{2-[(1-3/8)*60%]}*1/4
请您把过程写出.
参考答案:18*3/7＋0.65*8/13-2/7*18+5/13*0.65
=18*(3/7-2/7)+0.65*(8/13+5/13)
=18/7+0.65
=451/140
425÷17/5+55/12*55/12*24/11-245/24
=425*5/17+55/12*55/12*24/11-245/24
=125+1100/24-245/24
=125+855/24
=3855/24
7.087-14/3*0.72+57/64÷2.85
=7.087-3.36+0.3125
=4.0395
169/2-{2-[(1-3/8)*60%]}*1/4
=169/2-1/2+3/32
=84又3/32