407
1)0,71-1/4= 71/100-25/100= 46/100= 23/50
2)0,71+1/4= 71/100+25/100= 96/100= 24/25
3) 23/50:24/25= 23/50*25/24= 23/48
4) -15+9 1/3= -45/3+28/3= -17/3= -5 2/3
5) -5 2/3:2 5/9= -17/3:23/9= -17/3*9/23= -51/23= -2 5/23
6) -(-19 2/3+11 7/9)= 19 2/3-11 7/9= 19 6/9-11 7/9= 18 15/9-11 7/9= 7 8/9
7) 7 8/9*9/71= 71/9*9/71= 1
8)- 2 5/23:1= -2 5/23
9) 23/48*(-2 5/23)= 23/48*(-51/23)= -51/48= -17/16= -1 1/16
408
1) -(-3/5-0,425+1/200)= 120/200+85/200-1/200= 204/200= 51/50= 1 1/50
2) 1 1/50:0,01= 51/50:1/100= 51/50*100= 102
3) -(-30,75-1/12-3 1/6)= 30 9/12+1/12+3 2/12= 33 12/12= 34
4) 102:34= 3
5) 1/3:3= 1/3*1/3= 1/9
6) 1/9:2/3= 1/9*3/2= 1/6